HARQUAHALA FEB 28, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | *********** | **** 219 ** | *********** | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - FEB 27 v = Heat Units accumulated from JAN 1 - FEB 20 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 5 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : FEB 21 - FEB 27 This Week : FEB 28 - MAR 6 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 68 38 30 29 ---- Normal 71 39 32 38 Recorded 67 41 37 26 0.25 2009 73 41 30 46 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 53.4 FEB 21 ; Min = 43.3 FEB 23 WEATHER UPDATE -------------------------------- Soil temperatures should approach or exceed acceptable levels before planting. Planting into cool soil slows germination & can damage or weaken root systems, leaving the crop vulnerable to seedling disease. Soils are considered accept- able for planting when minimum soil temperatures remain at 60F & above. Minimum soil temperatures at seeding depth occur very near sunrise, and a manual (dial) thermometer provides the best means of checking temperatures. Because soil temp- eratures at seeding depth are closely related to air temperatures, forecasted weather conditions can help determine when soil temperatures will reach accept- able levels for planting. A good planting forecast: clear skies with highs above 80F and lows above 47F. HARQUAHALA MAR 7, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ************* | **** 253 **** | ************* | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - MAR 6 v = Heat Units accumulated from JAN 1 - FEB 27 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 4 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : FEB 28 - MAR 6 This Week : MAR 7 - MAR 13 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 71 39 32 38 ---- Normal 75 40 30 50 Recorded 70 41 41 34 0.03 2009 81 43 22 66 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 53.4 FEB 28 ; Min = 49.6 MAR 5 WEATHER UPDATE -------------------------------- Expect cool & unsettled weather through mid-week as a series of storm systems pass close to AZ. Sunny & much warmer weather is expected for later this week. Planting into cool soil slows germination & can damage or weaken root systems, leaving the crop vulnerable to seedling disease. Soils are considered accept- able for planting when minimum soil temperatures remain at 60F & above. Minimum soil temperatures at seeding depth occur very near sunrise, and a manual (dial) thermometer provides the best means of checking temperatures. Air temperatures are closely related to soil temperatures at seeding depth & weather forecasts can help determine when soil temperatures reach acceptable levels for planting. A good planting forecast: clear skies with highs above 80F and lows above 47F. HARQUAHALA MAR 14, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ************* | **** 269 **** | ************* | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - MAR 13 v = Heat Units accumulated from JAN 1 - MAR 6 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 8 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 7 - MAR 13 This Week : MAR 14 - MAR 20 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 75 40 30 50 ---- Normal 79 44 32 65 Recorded 63 39 39 15 0.63 2009 75 39 29 50 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 56.8 MAR 7 ; Min = 46.2 MAR 10 WEATHER UPDATE -------------------------------- Sunny, warm & dry weather is expected this week. Forecasted temperatures should allow soil temperatures to reach acceptable levels for planting in low desert locations. Growers in Yuma Co. are encouraged to complete their planting as soon as possible to minimize problems with heat stress later this summer. Soils are considered acceptable for planting when minimum soil temperatures re- main at 60F & above. Minimum soil temperatures at seeding depth occur very near sunrise. A manual thermometer provides the best means of checking temperatures. Soil temperatures typically reach acceptable levels for planting when air temp- eratures exceed 80F during the day & remain above 47F at night. HARQUAHALA MAR 21, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | **************** | ****** 330 ***** | **************** | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - MAR 20 v = Heat Units accumulated from JAN 1 - MAR 13 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 6 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 14 - MAR 20 This Week : MAR 21 - MAR 27 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 79 44 32 65 ---- Normal 81 44 30 72 Recorded 77 45 33 61 0.00 2009 86 45 23 89 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 60.1 MAR 19 ; Min = 51.4 MAR 14 WEATHER UPDATE -------------------------------- A storm system will impact AZ on Tuesday, bringing cloudy, windy & cooler temp- eratures with a chance for showers. Clear & warmer weather is expected later in the week. Long range forecasts indicate another storm system for this weekend. Growers should monitor the development of both storms if planting this week. Soils are considered acceptable for planting when minimum soil temperatures re- main at 60F & above. Minimum soil temperatures at seeding depth occur very near sunrise. A manual thermometer provides the best means of checking temperatures. Soil temperatures typically reach acceptable levels for planting when air temp- eratures exceed 80F during the day & remain above 47F at night. HARQUAHALA MAR 28, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ******************* | ******** 382 ****** | ******************* | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - MAR 27 v = Heat Units accumulated from JAN 1 - MAR 20 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 7 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 21 - MAR 27 This Week : MAR 28 - APR 3 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 81 44 30 72 ---- Normal 75 43 32 56 Recorded 76 42 31 53 0.01 2009 81 46 30 76 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 62.2 MAR 23 ; Min = 55.4 MAR 25 WEATHER UPDATE -------------------------------- Another strong, cold storm system is forecast to impact AZ late this week. Sunny, breezy & warm conditions will prevail through Tuesday, followed by windy & much cooler conditions Wednesday through Friday. Temperatures should run 10-15 degrees below normal late this week with precipitation possible Thursday & Friday. Sunny & warmer conditions redevelop for the weekend. Heat unit (HU) accumulation has reached 400 at most central AZ locations. The 400 value marks the opening of the planting windows as shown above. Planting windows represent the optimal planting period for cotton provided soil temperatures are acceptable (60F at sunrise) & the forecast calls for warm (80F+) & dry conditions. HARQUAHALA APR 4, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ********************** | ********* 440 ******** | ********************** | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - APR 3 v = Heat Units accumulated from JAN 1 - MAR 27 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 9 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 28 - APR 3 This Week : APR 4 - APR 10 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 75 43 32 56 ---- Normal 77 43 30 61 Recorded 78 42 27 59 0.00 2009 82 46 28 78 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 62.8 MAR 31 ; Min = 55.8 MAR 28 WEATHER UPDATE -------------------------------- A storm system will pass north of AZ on Monday, bringing windy & cooler tempera- tures through Tuesday. No precipitation is expected with this system. High pres- sure will develop over AZ by mid-week, bringing sunny skies & above normal temp- eratures through the weekend. Heat unit accumulation now exceeds 400 at most central & western AZ locations. The 400 value marks the opening of the planting windows as shown above. Planting windows represent the optimal planting period for cotton provided soil tempera- tures are acceptable (60F at sunrise) & the forecast calls for warm (80F+) & dry conditions. HARQUAHALA APR 11, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ************************** | *********** 512 ********** | ************************** | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - APR 10 v = Heat Units accumulated from JAN 1 - APR 3 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 7 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 4 - APR 10 This Week : APR 11 - APR 17 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 77 43 30 61 ---- Normal 82 44 27 73 Recorded 81 44 23 72 0.00 2009 86 50 23 97 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 62.2 APR 7 ; Min = 59.2 APR 8 WEATHER UPDATE -------------------------------- A strong storm system will pass through the Great Basin on Monday, bringing high winds & cooler temperatures through Tuesday. No precipitation is expected with this system. Rapid warming is expected following the passage of this storm with temperatures forecast to reach the 90s in central & western AZ late in the week. Heat unit accumulation will exceed 600 at most central & western AZ locations by week's end (see graph). Growers are encouraged to plant full season varieties as soon as possible & preferably before HU accumulation exceeds 700. Soil tempera- tures typically remain at acceptable levels for germination (60F+ at 8am) when air temperatures exceed 80F during the day & remain at 48F & above at night. HARQUAHALA APR 18, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ****************************** | ************* 592 ************ | ****************************** | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - APR 17 v = Heat Units accumulated from JAN 1 - APR 10 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 5 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 11 - APR 17 This Week : APR 18 - APR 24 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 82 44 27 73 ---- Normal 86 48 32 93 Recorded 83 46 28 80 0.00 2009 86 46 21 91 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 66.2 APR 16 ; Min = 61 APR 14 WEATHER UPDATE -------------------------------- A weak storm system will produce clouds & slightly cooler temperatures Monday. Light showers are possible Monday,particularly in southern & eastern production areas. A much stronger storm is forecast to impact AZ Wednesday through Friday with high winds, much cooler temperatures & a chance for showers/thunderstorms. Expect daytime temperatures to run 15F below normal later this week. Warmer con- ditions are forecast for the weekend. Heat unit accumulation now exceeds 600 at most central & western AZ locations. While this week's forecast offers signifi- cant challenges for planting, Growers are encouraged to plant full season varie- ties as soon as possible. Medium & early maturing varieties are recommended once HU accumulation exceeds 700. HARQUAHALA APR 25, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ********************************* | ************** 668 ************** | ********************************* | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - APR 24 v = Heat Units accumulated from JAN 1 - APR 17 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 6 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 18 - APR 24 This Week : APR 25 - MAY 1 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 86 48 32 93 ---- Normal 90 51 32 109 Recorded 79 49 35 75 0.00 2009 90 52 23 110 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 70.5 APR 21 ; Min = 60.3 APR 23 WEATHER UPDATE -------------------------------- High pressure will dominate AZ weather through Tuesday, producing sunny & warm weather. A strong storm system will pass north of AZ on Wednesday, bringing high winds & much cooler temperatures. Long range forecasts indicate another storm system will impact AZ this weekend, keeping temperatures cool & providing a chance for showers. The optimal range for plant population is 25,000-50,000 plants/acre. To estimate plant population, count the number of plants in 1/1000 acre & multiply by 1000. Row length corresponding to 1/1000 acre = 13'1" (40" rows), 13'9" (38" rows), 14'6" (36" rows) and 17'5" (30" rows). HARQUAHALA MAY 2, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ************************************** | ***************** 752 **************** | ************************************** | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - MAY 1 v = Heat Units accumulated from JAN 1 - APR 24 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 6 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 25 - MAY 1 This Week : MAY 2 - MAY 8 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 90 51 32 109 ---- Normal 92 52 33 114 Recorded 84 48 27 85 0.00 2009 88 50 26 99 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 71.1 APR 28 ; Min = 62.2 APR 30 WEATHER UPDATE -------------------------------- High pressure will produce clear skies & warmer temperatures this week. Sunny & mild conditions on Monday will be followed by a rapid warmup by mid-week. Expect warm days & mild nights beginning Tuesday & continuing through the weekend. No precipitation is expected this week. The optimal range for plant population is 25,000-50,000 plants/acre. To estimate plant population, count the number of plants in 1/1000 acre & multiply by 1000. Row length corresponding to 1/1000 acre = 13'1" (40" rows), 13'9" (38" rows), 14'6" (36" rows) and 17'5" (30" rows). HARQUAHALA MAY 9, 2010 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ******************************************* | ******************** 857 ****************** | ******************************************* | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - MAY 8 v = Heat Units accumulated from JAN 1 - MAY 1 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 6 days behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAY 2 - MAY 8 This Week : MAY 9 - MAY 15 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 92 52 33 114 ---- Normal 94 56 35 126 Recorded 90 50 26 107 0.00 2009 90 54 36 110 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 72.5 MAY 8 ; Min = 63.5 MAY 3 WEATHER UPDATE -------------------------------- A pair of storm systems will pass through the Great Basin early this week, bringing cooler temperatures & windy conditions through mid-week. Expect below normal temperatures to develop Monday & continue into Thursday. A gradual warm- ing trend will begin Thursday & continue into the coming weekend. No precipita- tion is expected this week. Pinhead square (PHS) represents an important early season development stage. These first squares typically form on the 7th node above the cotyledons when HU accumulation after planting totals ~700. Growers should monitor soil moisture as the crop approaches PHS. Often, the first post plant irrigation is needed between PHS & susceptible square when HU accumulation after planting totals ~900. HARQUAHALA COTTON DEVELOPMENT ADVISORY MAY 16, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | v | | | | | | | | 3/15************* 665 -4 days | v | | | | | | | | 4/1 ********** 519 -4 days | v | | | | | | | | 4/15******** 383 -4 days |v | | | | | | | | 5/1 **** 195 -2 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to MAY 15 v = Heat Units on MAY 8; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 946; Last year = 1095 HUs since Jan 1 are running about 8 days behind normal. HU last week = 87 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 9 - MAY 15 This Week : MAY 16 - MAY 22 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 94 56 35 126 ---- Normal 95 57 38 134 Recorded 84 50 29 87 0.00 2009 95 61 42 140 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 18% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): .42" .42" .42" .42" .42" WEATHER UPDATE -------------------------------- A dry storm system will pass north of AZ on Tuesday, bringing a brief period of windy conditions & cooler temperatures. Warm temperatures will return during the latter half of the week as high pressure redevelops over the region. Long range forecasts indicate another dry period of windy & cooler weather this weekend. Pinhead square (PHS) represents an important early season development stage. These first squares typically form on the 7th node above the cotyledons when HU accumulation after planting totals ~700. Growers should monitor soil moisture as the crop approaches PHS. Often, the first post plant irrigation is needed between PHS & susceptible square when HU accumulation after planting totals ~900. HARQUAHALA COTTON DEVELOPMENT ADVISORY MAY 23, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | v| | | | | | | | 3/15**************** 776 -6 days | v | | | | | | | | 4/1 ************* 630 -5 days | v | | | | | | | | 4/15********** 494 -5 days | v | | | | | | | | 5/1 ****** 306 -3 days | | | | | | | | | 5/15** 112 0 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to MAY 22 v = Heat Units on MAY 15; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1057; Last year = 1235 HUs since Jan 1 are running about 9 days behind normal. HU last week = 113 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 16 - MAY 22 This Week : MAY 23 - MAY 29 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 95 57 38 134 ---- Normal 95 58 40 134 Recorded 90 53 37 113 0.00 2009 79 50 41 74 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 27% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): .49" .43" .43" .43" .43" WEATHER UPDATE -------------------------------- Sunny & abnormally cool weather on Monday will give way to rapid warming by mid- week as high pressure redevelops over AZ. Expect clear skies & near normal temp- eratures for the latter half of the week. Long range forecasts indicate another storm system may impact AZ this weekend. Nitrogen (N) should be applied in split applications between pinhead square (PHS) & peak bloom (PB). PHS typically occurs when heat unit (HU) accumulation after planting totals ~700 while PB develops at ~2000 HU after planting (see graph above). For more details see publication "Nitrogen Management for Cotton" at: http://ag.arizona.edu/crops/cotton/soilmgt/nitrogen_management.html. HARQUAHALA COTTON DEVELOPMENT ADVISORY MAY 30, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | v | | | | | | | 3/15***************** 864 -7 days | v| | | | | | | | 4/1 ************** 718 -6 days | v | | | | | | | | 4/15************ 582 -7 days | v | | | | | | | | 5/1 ******** 394 -5 days |v | | | | | | | | 5/15**** 200 -2 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to MAY 29 v = Heat Units on MAY 22; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1145; Last year = 1309 HUs since Jan 1 are running about 11 days behind normal. HU last week = 87 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 23 - MAY 29 This Week : MAY 30 - JUN 5 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 95 58 40 134 ---- Normal 97 59 38 140 Recorded 85 47 34 87 0.00 2009 95 55 38 127 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 36% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): .56" .39" .39" .39" .39" WEATHER UPDATE -------------------------------- Typical early June weather will prevail this week! High pressure will develop over AZ this week producing clear skies, hot temperatures & very low humidity. Tempera- tures will increase as the week progresses, approaching 5-10 degrees above normal by the weekend. Nitrogen should be applied in split applications between pinhead square (PHS) & peak bloom (PB). PHS typically occurs when heat unit accumulation after planting (HUAP) totals ~700 while PB develops at ~2000 HUAP (see graph). See publication at: http://ag.arizona.edu/crops/cotton/soilmgt/nitrogen_management.html for details. Growers should closely monitor soil moisture. Water stress can cause square abortion & further delay an already late crop. The first post-plant irriga- tion is typically needed between 700 & 900 HUAP. HARQUAHALA COTTON DEVELOPMENT ADVISORY JUN 6, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | v| | | | | | | 3/15******************** 993 -8 days | v | | | | | | | 4/1 ***************** 847 -8 days | v | | | | | | | | 4/15************** 711 -8 days | v | | | | | | | | 5/1 ********** 523 -6 days | v | | | | | | | | 5/15******* 329 -3 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to JUN 5 v = Heat Units on MAY 29; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1274; Last year = 1436 HUs since Jan 1 are running about 11 days behind normal. HU last week = 129 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 30 - JUN 5 This Week : JUN 6 - JUN 12 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 97 59 38 140 ---- Normal 98 59 39 141 Recorded 96 55 38 129 0.00 2009 99 57 39 140 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 52% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): .78" .58" .43" .43" .43" WEATHER UPDATE -------------------------------- Strong high pressure will produce hot & dry conditions through mid-week. A trough of low pressure is forecast to enter Northern AZ mid-week, leading to an increase in winds & a gradual cooling trend. No precipitation is expected with this system. Water stress can cause square abortion & further delay this year's crop. The first post-plant irrigation is usually needed between 700 & 900 heat units after plant- ing (HUAP). Nitrogen should be applied in split applications between 700 HUAP & peak bloom (~2000 HUAP). For more details see following publications on ACIS: Irrigation: http://ag.arizona.edu/crops/cotton/cropmgt/post_plant_irrigation.html. Nitrogen: http://ag.arizona.edu/crops/cotton/soilmgt/nitrogen_management.html. HARQUAHALA COTTON DEVELOPMENT ADVISORY JUN 13, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | v | | | | | | 3/15*********************** 1148 -7 days | | v| | | | | | | 4/1 ******************** 1002 -6 days | v | | | | | | | 4/15***************** 866 -7 days | v | | | | | | | | 5/1 ************** 678 -5 days | v | | | | | | | | 5/15********** 484 -2 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to JUN 12 v = Heat Units on JUN 5; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1429; Last year = 1576 HUs since Jan 1 are running about 11 days behind normal. HU last week = 154 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 6 - JUN 12 This Week : JUN 13 - JUN 19 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 98 59 39 141 ---- Normal 102 63 42 159 Recorded 95 65 49 154 0.10 2009 108 64 45 169 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 69% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.04" .83" .63" .45" .45" HEAT STRESS LEVELS -------------------------------- Date 6/6 6/7 6/8 6/9 6/10 6/11 6/12 Stress ns ns ns ns ns ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- High pressure will redevelop over the region, replacing the unusually cool week- end weather. Temperatures should average near normal with clear skies & very low humidity. The 2010 crop is running behind normal due to later planting dates & cool spring weather. Proper management of water & N are key over the next few weeks. The normal arrival date for the monsoon is just 4 weeks away & will pro- vide the next hurdle for the 2010 crop. Early monsoon forecasts indicate a bias for: 1) a later arrival date, 2) inconsistent humidity (occasional dry periods) & 3) above normal temperatures. Publications on water & N management are at: Irrigation: http://ag.arizona.edu/crops/cotton/cropmgt/post_plant_irrigation.html. Nitrogen: http://ag.arizona.edu/crops/cotton/soilmgt/nitrogen_management.html. HARQUAHALA COTTON DEVELOPMENT ADVISORY JUN 20, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | v| | | | | | 3/15************************** 1286 -7 days | | | v | | | | | | 4/1 *********************** 1140 -6 days | | v| | | | | | | 4/15******************** 1004 -7 days | v | | | | | | | 5/1 **************** 816 -5 days | v | | | | | | | | 5/15************ 622 -3 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to JUN 19 v = Heat Units on JUN 12; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1567; Last year = 1745 HUs since Jan 1 are running about 11 days behind normal. HU last week = 137 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 13 - JUN 19 This Week : JUN 20 - JUN 26 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 102 63 42 159 ---- Normal 102 66 44 168 Recorded 97 57 43 137 0.00 2009 108 66 44 174 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 81% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.25" 1.04" .84" .57" .45" HEAT STRESS LEVELS -------------------------------- Date 6/13 6/14 6/15 6/16 6/17 6/18 6/19 Stress ns ns ns ns ns ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- High pressure & southwesterly flow will keep AZ hot & dry this week. Expect above normal daytime temperatures, mild evenings & little chance for rain. Some moisture has arrived in central Mexico & may be transported into far eastern AZ later this week, providing a chance for mostly high elevation thunderstorms. The 2010 crop continues to run behind normal. This week's forecast should allow the crop to make up some ground. Late June is the peak period for atmospheric evaporative demand & crop water use is accelerating due to rapid canopy develop- ment (see text above). Monitor soil moisture closely & avoid water stress. Water stress leads to the shedding of squares -- something to avoid with a late crop. HARQUAHALA COTTON DEVELOPMENT ADVISORY JUN 27, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | v | | | | | 3/15***************************** 1439 -8 days | | | v| | | | | | 4/1 ************************** 1293 -7 days | | | v | | | | | | 4/15*********************** 1157 -7 days | | v | | | | | | | 5/1 ******************* 969 -6 days | v | | | | | | | | 5/15**************** 775 -4 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to JUN 26 v = Heat Units on JUN 19; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1720; Last year = 1919 HUs since Jan 1 are running about 10 days behind normal. HU last week = 152 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 20 - JUN 26 This Week : JUN 27 - JUL 3 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 102 66 44 168 ---- Normal 106 68 45 177 Recorded 102 61 37 152 0.00 2009 109 75 45 196 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 90% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.5" 1.28" 1.08" .8" .51" HEAT STRESS LEVELS -------------------------------- Date 6/20 6/21 6/22 6/23 6/24 6/25 6/26 Stress ns ns ns ns ns ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Sunny with above normal temperatures this week. Some moisture may leak into eastern production areas early in the week, producing scattered afternoon & evening thunderstorms -- mostly in high elevation areas. Low humidity is expected to remain in place across central & western AZ. Current forecasts indicate the hot & dry weather will continue through the holiday weekend; however, moisture from tropical storm Alex could alter this forecast. Monitor soil moisture closely & avoid water stress. Water stress leads to square shedding -- something to avoid with a late crop. Water stress also increases canopy temperatures and may increase the potential for heat stress. HARQUAHALA COTTON DEVELOPMENT ADVISORY JUL 4, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | v | | | | | 3/15******************************** 1617 -7 days | | | | v | | | | | 4/1 ***************************** 1471 -6 days | | | v| | | | | | 4/15*************************** 1335 -6 days | | |v | | | | | | 5/1 *********************** 1147 -5 days | | v | | | | | | | 5/15******************* 953 -3 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to JUL 3 v = Heat Units on JUN 26; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1898; Last year = 2115 HUs since Jan 1 are running about 10 days behind normal. HU last week = 178 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 27 - JUL 3 This Week : JUL 4 - JUL 10 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 106 68 45 177 ---- Normal 103 73 56 189 Recorded 106 68 44 178 0.00 2009 106 75 58 198 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 96% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2" 1.75" 1.52" 1.2" .87" HEAT STRESS LEVELS -------------------------------- Date 6/27 6/28 6/29 6/30 7/1 7/2 7/3 Stress ns ns ns ns L1 ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Sunny & warm with very low humidity through mid-week. Expect a gradual increase in temperatures through Thursday. Moisture is expected to return to AZ by late in the week as a tropical disturbance moves in from the Gulf of Mexico. Humidity levels will increase beginning Wednesday in Southeast AZ & may rise along the Colorado River by the weekend. Widely scattered thunderstorms are possible in southeast & central production areas late in the week. Humidity when combined with high temperatures can produce heat stress conditions. Heat stress causes young 3-5 day old bolls to abort, lowering overall fruit retention. Updates on heat stress are available at: http://ag.arizona.edu/azmet/cotton.htm#HEATSTRESS. For more information on heat stress see: http://ag.arizona.edu/azmet/az1448.pdf. HARQUAHALA COTTON DEVELOPMENT ADVISORY JUL 11, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | |v | | | | 3/15************************************ 1796 -7 days | | | | v | | | | | 4/1 ********************************* 1650 -6 days | | | | v | | | | | 4/15****************************** 1514 -7 days | | | v| | | | | | 5/1 *************************** 1326 -5 days | | |v | | | | | | 5/15*********************** 1132 -3 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to JUL 10 v = Heat Units on JUL 3; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2077; Last year = 2313 HUs since Jan 1 are running about 10 days behind normal. HU last week = 179 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 4 - JUL 10 This Week : JUL 11 - JUL 17 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 103 73 56 189 ---- Normal 105 73 53 191 Recorded 104 69 42 179 0.00 2009 102 75 65 196 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.12" 1.9" 1.68" 1.39" 1.08" HEAT STRESS LEVELS -------------------------------- Date 7/4 7/5 7/6 7/7 7/8 7/9 7/10 Stress ns ns ns ns ns ns L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- High pressure will develop over AZ this week, bringing a return to very high temperatures. Humidity levels should decline through Thursday, but will remain sufficiently high to generate heat stress conditions in the western & central production areas. Humidity levels are forecast to increase by the weekend & should generate an uptick in thunderstorm activity. Heat stress conditions developed in most locations in recent days. Heat stress causes young 3-5 day old bolls to abort, lowering overall fruit retention. For heat stress updates go to: http://ag.arizona.edu/azmet/cotton.htm#HEATSTRESS. For more information on heat stress see: http://ag.arizona.edu/azmet/az1448.pdf. HARQUAHALA COTTON DEVELOPMENT ADVISORY JUL 18, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | v | | | | 3/15**************************************** 2004 -6 days | | | | | v | | | | 4/1 ************************************* 1858 -6 days | | | | v| | | | | 4/15********************************** 1722 -6 days | | | | v | | | | | 5/1 ******************************* 1534 -5 days | | | v| | | | | | 5/15*************************** 1340 -3 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to JUL 17 v = Heat Units on JUL 10; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2285; Last year = 2509 HUs since Jan 1 are running about 9 days behind normal. HU last week = 209 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 11 - JUL 17 This Week : JUL 18 - JUL 24 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 105 73 53 191 ---- Normal 105 73 55 192 Recorded 108 80 55 209 0.00 2009 102 77 61 199 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.77" 2.51" 2.27" 1.93" 1.59" HEAT STRESS LEVELS -------------------------------- Date 7/11 7/12 7/13 7/14 7/15 7/16 7/17 Stress L1 L1 L1 L1 L2 L2 L2 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- High pressure that produced last week's very hot conditions will shift to the southern Great Plains this week, allowing temperatures to cool slightly. Some decrease in humidity is possible in western production areas as the high shifts positions. Forecasters expect moisture will continue to flow into southeastern & central production areas, providing the chance for scattered thunderstorms each day. Level 2 heat stress (L2 HS) developed in many locations last week. L2 HS often results in heavy fruit shed & can damage young squares resulting in a 2nd period of low fruit retention (FR) when these squares mature & bloom. FR typical- ly improves once heat stress conditions abate (with lower temperatures/humidity). For daily HS updates go to: http://ag.arizona.edu/azmet/cotton.htm#HEATSTRESS. HARQUAHALA COTTON DEVELOPMENT ADVISORY JUL 25, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | v| | | | 3/15******************************************** 2210 -6 days | | | | | v | | | | 4/1 ***************************************** 2064 -5 days | | | | | v | | | | 4/15*************************************** 1928 -5 days | | | | v | | | | 5/1 *********************************** 1740 -4 days | | | | v | | | | | 5/15******************************* 1546 -2 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to JUL 24 v = Heat Units on JUL 17; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2491; Last year = 2708 HUs since Jan 1 are running about 8 days behind normal. HU last week = 206 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 18 - JUL 24 This Week : JUL 25 - JUL 31 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 105 73 55 192 ---- Normal 105 75 59 195 Recorded 104 80 57 206 0.00 2009 106 75 53 197 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.45" 2.45" 2.26" 1.97" 1.67" HEAT STRESS LEVELS -------------------------------- Date 7/18 7/19 7/20 7/21 7/22 7/23 7/24 Stress L2 L1 L1 L1 ns ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Monsoon flow will remain in place this week with an uptick in moisture expected Tuesday through Thursday. This added moisture will produce below normal tempera- tures for a few days & increased chances for afternoon thunderstorms. Present forecasts call for the moisture to remain in place in eastern & south central production areas through the weekend. Warmer temperatures are expected in the west later this week. L2 heat stress (HS) developed in most low desert locations last week. L2 HS often results in heavy fruit shed & can damage young squares resulting in a 2nd period of low fruit retention about 2 weeks later when these squares mature & bloom. FR typically improves once HS conditions abate. Daily HS reports are available at: http://ag.arizona.edu/azmet/cotton.htm#HEATSTRESS. HARQUAHALA COTTON DEVELOPMENT ADVISORY AUG 1, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | v | | | 3/15************************************************ 2413 -5 days | | | | | v | | | 4/1 ********************************************* 2267 -5 days | | | | | v | | | | 4/15******************************************* 2131 -5 days | | | | | v | | | | 5/1 *************************************** 1943 -4 days | | | | v | | | | 5/15*********************************** 1749 -2 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to JUL 31 v = Heat Units on JUL 24; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2694; Last year = 2905 HUs since Jan 1 are running about 8 days behind normal. HU last week = 203 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 25 - JUL 31 This Week : AUG 1 - AUG 7 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 105 75 59 195 ---- Normal 106 77 58 199 Recorded 100 79 61 203 0.05 2009 106 79 52 206 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.17" 2.17" 2.17" 2.01" 1.75" HEAT STRESS LEVELS -------------------------------- Date 7/25 7/26 7/27 7/28 7/29 7/30 7/31 Stress L1 L1 ns L1 L1 L1 ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Drier air is forecast to enter the region this week, bringing a return to warmer, more seasonable temperatures throughout AZ. The drier air will decrease cloud- iness & lower the chances for precipitation for much of the week. Another surge of moisture is expected to enter southeastern & south central production areas Friday, increasing the chances for precipitation again. The cool & moisture con- ditions during the past week minimized problems with heat stress (HS). Fruit retention (FR) should improve in crops where FR was adversely affected by the mid-July run of HS. For more on HS see: http://www.ag.arizona.edu/azmet/az1448.pdf HARQUAHALA COTTON DEVELOPMENT ADVISORY AUG 8, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | v | | | 3/15**************************************************** 2597 -6 days | | | | | | v | | | 4/1 ************************************************* 2451 -5 days | | | | | | v | | | 4/15********************************************** 2315 -6 days | | | | | v | | | | 5/1 ******************************************* 2127 -4 days | | | | | v | | | | 5/15*************************************** 1933 -2 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to AUG 7 v = Heat Units on JUL 31; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2878; Last year = 3111 HUs since Jan 1 are running about 8 days behind normal. HU last week = 184 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 1 - AUG 7 This Week : AUG 8 - AUG 14 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 106 77 58 199 ---- Normal 103 74 58 192 Recorded 100 72 54 184 0.02 2009 104 77 60 202 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.1" 2.1" 2.1" 2.1" 1.94" HEAT STRESS LEVELS -------------------------------- Date 8/1 8/2 8/3 8/4 8/5 8/6 8/7 Stress ns ns ns ns ns ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- A trough of low pressure is forecast to move into the Great Basin Tuesday. This system will produce a warm & dry southwesterly flow regime across AZ for much of the week. Temperatures should once again rise to very high levels, but humidity levels will be much lower, resulting in cooler nighttime conditions. Precipitation will be widely scattered & limited to high elevation areas. Long range forecasts call for a return to monsoon conditions late this week (about Friday). The lower humidity should minimize problems with severe heat stress (HS) this week. HS has been far less prevalent over the past two weeks. Fruit retention (FR) should be improving during these periods with minimal stress. For more on HS see publication at: http://www.ag.arizona.edu/azmet/az1448.pdf HARQUAHALA COTTON DEVELOPMENT ADVISORY AUG 15, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | v| | | 3/15******************************************************** 2776 -6 days | | | | | | v | | | 4/1 ***************************************************** 2630 -6 days | | | | | | v | | | 4/15************************************************** 2494 -6 days | | | | | | v | | | 5/1 ********************************************** 2306 -5 days | | | | | v | | | | 5/15****************************************** 2112 -3 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to AUG 14 v = Heat Units on AUG 7; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3057; Last year = 3313 HUs since Jan 1 are running about 9 days behind normal. HU last week = 179 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 8 - AUG 14 This Week : AUG 15 - AUG 21 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 103 74 58 192 ---- Normal 105 76 61 197 Recorded 105 69 47 179 0.00 2009 104 75 59 198 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.39" 2.39" 2.39" 2.39" 2.39" HEAT STRESS LEVELS -------------------------------- Date 8/8 8/9 8/10 8/11 8/12 8/13 8/14 Stress ns ns ns ns ns ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Monsoon flow will return early this week, resulting in increased humidity, cool- er temperatures & an increased chance for afternoon & evening thunderstorms. This pattern, however, is forecast to be short lived as high pressure is expected to redevelop over AZ by mid-week, bringing a return to hot & dry conditions. Heat stress (HS) has not been a problem for much of August & fruit retention should be improving in low elevation areas that were negatively impacted by the July HS. Crop development is running behind normal due to the cool 2010 growing season. As plans proceed for finishing the 2010 crop, growers may find the report "Boll Maturity Dates for Late Season Cotton Flowers" of interest. The report is avail- able at http://ag.arizona.edu/azmet/Boll_Maturity_2010.pdf. HARQUAHALA COTTON DEVELOPMENT ADVISORY AUG 22, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | v | | 3/15************************************************************ 2976 -6 days | | | | | | v | | 4/1 ********************************************************* 2830 -6 days | | | | | | v | | | 4/15****************************************************** 2694 -6 days | | | | | | v | | | 5/1 ************************************************** 2506 -4 days | | | | | |v | | | 5/15********************************************** 2312 -3 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to AUG 21 v = Heat Units on AUG 14; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3257; Last year = 3511 HUs since Jan 1 are running about 9 days behind normal. HU last week = 202 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 15 - AUG 21 This Week : AUG 22 - AUG 28 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 105 76 61 197 ---- Normal 105 75 59 195 Recorded 105 77 65 202 0.68 2009 102 73 54 191 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.27" 2.27" 2.27" 2.27" 2.27" HEAT STRESS LEVELS -------------------------------- Date 8/15 8/16 8/17 8/18 8/19 8/20 8/21 Stress L1 L1 ns ns L1 L1 L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Hot & humid conditions will prevail across all of AZ through Thursday. High pressure will develop over AZ this week, resulting in very high daytime temp- eratures & moderate to high humidity levels. The best chances for precipitation will be Tuesday through Thursday. A trough of low pressure will develop along the CA coast late in the week & will eventually push the moisture out of central & western AZ. The higher humidity will remain in southeast AZ throughout the week. Heat stress will redevelop in central & western production areas & may reach the Level 2 category. Growers are encouraged to review the report entitled "Boll Mat- urity Dates for Late Season Cotton Flowers" as they finalize plans for crop term- ination. The report is at http://ag.arizona.edu/azmet/Boll_Maturity_2010.pdf. HARQUAHALA COTTON DEVELOPMENT ADVISORY AUG 29, 2010 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | v | | 3/15**************************************************************** 3178 -6 days | | | | | | | v | | 4/1 ************************************************************* 3032 -6 days | | | | | | |v | | 4/15********************************************************** 2896 -6 days | | | | | | v | | | 5/1 ****************************************************** 2708 -5 days | | | | | | v | | | 5/15************************************************** 2514 -3 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to AUG 28 v = Heat Units on AUG 21; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3459; Last year = 3702 HUs since Jan 1 are running about 8 days behind normal. HU last week = 202 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 22 - AUG 28 This Week : AUG 29 - SEP 4 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 105 75 59 195 ---- Normal 100 72 59 184 Recorded 102 77 63 202 0.00 2009 100 73 68 189 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.18" 2.34" 2.34" 2.34" 2.34" HEAT STRESS LEVELS -------------------------------- Date 8/22 8/23 8/24 8/25 8/26 8/27 8/28 Stress L1 L2 L1 L1 L1 ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- A trough of low pressure will push the humidity into NM this week. Expect sunny & dry conditions through Thursday with increasing temperatures. Daytime tempera- tures should reach 110F in central/western production areas by Thursday. Long range forecasts suggest the humidity will return this coming weekend providing a chance for isolated thunderstorms in central/eastern production areas. Growers are urged to review the report entitled "Boll Maturity Dates for Late Season Cotton Flowers" at http://ag.arizona.edu/azmet/Boll_Maturity_2010.pdf as they finalize plans for crop termination. THIS IS THE FINAL SCHEDULED COTTON ADVISORY FOR THE 2010 SEASON. HAVE A SAFE & PROFITABLE HARVEST SEASON!