BUCKEYE MAR 1, 2009 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ***************** | ****** 340 ****** | ***************** | | ^ 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 1 v = Heat Units accumulated from JAN 1 - FEB 21 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 10 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : FEB 22 - MAR 1 This Week : MAR 1 - MAR 7 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 69 42 31 35 ---- Normal 71 44 35 42 Recorded 82 47 37 80 0.00 2008 72 39 32 38 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 58.6 FEB 25 ; Min = 55 FEB 22 WEATHER UPDATE -------------------------------- High pressure will produce sunny skies & very warm temperatures through midweek. This high pressure will give way to a trough of low pressure that will bring cloudy & cooler weather late in the week. Current forecasts indicate most of the moisture will pass north of AZ, but growers planning to plant this week should monitor this storm closely. Air temperatures can be used to estimate when soil temperatures approach accept- able levels for germination. A forecast calling for clear skies with highs above 80F and lows of 48F & above will typically produce soil temperatures that reside in the acceptable to optimal range for germination. BUCKEYE MAR 8, 2009 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ******************** | ******** 407 ******* | ******************** | | ^ 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 7 v = Heat Units accumulated from JAN 1 - FEB 28 *HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 11 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 1 - MAR 7 This Week : MAR 8 - MAR 14 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 71 44 35 42 ---- Normal 74 43 35 49 Recorded 78 47 31 66 0.00 2008 79 45 25 69 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 62.6 MAR 3 ; Min = 56.5 MAR 7 WEATHER UPDATE -------------------------------- The weak storm system impacting central & southeastern production areas should exit the state late Monday. Expect breezy conditions in the wake of this storm through Tuesday, then a return to sunny weather with near normal temperatures. A second storm system is expected to develop over the West later in the week, but this system should track north of AZ & not greatly impact our weather. Air temperatures can be used to estimate when soil temperatures approach accept- able levels for germination. A forecast calling for clear skies with highs above 80F and lows of 48F & above will typically produce soil temperatures that reside in the acceptable to optimal range for germination. BUCKEYE MAR 15, 2009 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | *********************** | ********** 463 ******** | *********************** | | ^ 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 14 v = Heat Units accumulated from JAN 1 - MAR 7 *HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 9 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 8 - MAR 14 This Week : MAR 15 - MAR 21 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 74 43 35 49 ---- Normal 78 47 35 65 Recorded 76 44 35 55 0.00 2008 77 41 33 58 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 61.2 MAR 14 ; Min = 56.3 MAR 8 WEATHER UPDATE -------------------------------- Sunny & much warmer weather is expected across all of AZ this week. High pressure will build over the state & bring clear skies & warm temperatures for most of the week. A weak weather disturbance will develop late in the week, but present forecasts indicate this system will generate some cooling, moderate winds, but no precipitation. Heat unit accumulation now exceeds 400 in most central & western production areas. Full season varieties should be planted before the annual HU accumulation exceeds 700, provided soil temperatures & weather forecasts are acceptable. A good plant- ing forecast: clear weather with highs 80F & above and lows 48F and above. BUCKEYE MAR 22, 2009 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | **************************** | ************ 556 *********** | **************************** | | ^ 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 21 v = Heat Units accumulated from JAN 1 - MAR 14 *HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 11 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 15 - MAR 21 This Week : MAR 22 - MAR 28 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 78 47 35 65 ---- Normal 82 49 35 81 Recorded 87 47 32 94 0.00 2008 86 50 28 96 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 66.2 MAR 20 ; Min = 61 MAR 15 WEATHER UPDATE -------------------------------- Breezy & cool on Monday followed by a short lived warming trend through Wednesday. Another cool, dry storm system is forecast to move across Northern AZ on Thursday. This system bring windy weather on Thursday and the passage of another dry cold front. Long range forecasts call for much warmer weather this weekend, following the passage of this storm. Heat unit accumulation now exceeds 500 in most central & western production areas. Full season varieties should be planted before the annual HU accumulation exceeds 700, provided soil temperatures & weather forecasts are acceptable. A good plant- ing forecast: clear weather with highs 80F & above and lows 48F and above. BUCKEYE MAR 29, 2009 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ******************************* | ************** 618 ************ | ******************************* | | ^ 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 28 v = Heat Units accumulated from JAN 1 - MAR 21 *HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 12 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 22 - MAR 28 This Week : MAR 29 - APR 4 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 82 49 35 81 ---- Normal 75 47 37 58 Recorded 77 45 20 63 0.00 2008 79 46 34 71 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 68.9 MAR 22 ; Min = 61.3 MAR 28 WEATHER UPDATE -------------------------------- An unsettled week of weather is on tap for AZ. A series of dry cold fronts will move across the region this week, generating windy weather with low dew points & cool temperatures. The first front will move through on Monday and will bring strong winds & very dry conditions. A weaker dry front will move through midweek while a third, stronger front is expected to arrive on Friday. Precipitation is not expected with any of these fronts -- just winds and cool weather. Expect temperatures to average a few degrees below normal for the week. Good planting forecast: clear weather with highs 80F & above & lows 48F & above. BUCKEYE APR 5, 2009 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ********************************** | *************** 686 ************** | ********************************** | | ^ 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 4 v = Heat Units accumulated from JAN 1 - MAR 28 *HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 11 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 29 - APR 4 This Week : APR 5 - APR 11 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 75 47 37 58 ---- Normal 77 47 33 64 Recorded 79 45 24 69 0.00 2008 81 50 32 77 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 66.9 APR 3 ; Min = 62.2 MAR 31 WEATHER UPDATE -------------------------------- Expect another week of variable weather as a series of low pressure systems move across northern AZ & the Great Basin this week. The week will begin sunny & warm on Monday & Tuesday with moderate breezes. The first system will arrive Wednesday & bring windy conditions with much cooler temperatures. Temperatures & winds will moderate on Thursday before the second system arrives on Friday. The second system appears stronger & may produce scattered showers along with windy conditions & cooler temperatures. Long range forecasts indicate another system will impact AZ on Sunday. Temperatures should average about 3 degrees below normal this week. Good planting forecast: clear weather with highs 80F & above & lows 48F & above. BUCKEYE APR 12, 2009 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ************************************** | ***************** 760 **************** | ************************************** | | ^ 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 11 v = Heat Units accumulated from JAN 1 - APR 4 *HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 9 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 5 - APR 11 This Week : APR 12 - APR 18 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 77 47 33 64 ---- Normal 83 49 32 85 Recorded 80 48 30 75 0.24 2008 86 48 26 94 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 68.4 APR 8 ; Min = 62.1 APR 5 WEATHER UPDATE -------------------------------- The temperature roller coaster will continue this week. A strong storm system will move across AZ late Tuesday. Expect sunny & mild weather Monday followed by windy & mild conditions Tuesday. A strong cold front will move across AZ late Tuesday & bring windy & much cooler weather Tuesday night through Thursday. Precipitation should be limited to high elevation areas as this is a dry system. Expect warmer temperatures for the weekend as high pressure redevelops over AZ. Growers are encouraged to plant full season varieties before heat unit (HU) exceeds 700. Medium & shorter maturity varieties are recommended once HU accum- ulation exceeds 700. BUCKEYE APR 19, 2009 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ****************************************** | ******************* 832 ****************** | ****************************************** | | ^ 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 18 v = Heat Units accumulated from JAN 1 - APR 11 *HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 7 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 12 - APR 18 This Week : APR 19 - APR 25 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 83 49 32 85 ---- Normal 87 54 37 104 Recorded 79 47 34 72 0.00 2008 86 50 23 97 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 68.5 APR 15 ; Min = 60.3 APR 16 WEATHER UPDATE -------------------------------- Hot and dry conditions are forecast as a high pressure system remains over Arizona. Daily high temperatures will be in the mid-to-high 90s and nightly lows will be from the upper 50s to upper 60s. Skies will be clear and sunny early in the week with partly cloudy conditions starting on Thursday. No precipitation is expected during this week. Growers are encouraged to plant full season varieties before heat unit (HU) exceeds 700. Medium & shorter maturity varieties are recommended once HU accumulation exceeds 700. BUCKEYE APR 26, 2009 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ************************************************ | ********************** 960 ********************* | ************************************************ | | ^ 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 25 v = Heat Units accumulated from JAN 1 - APR 18 *HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 8 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 19 - APR 25 This Week : APR 26 - MAY 2 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 87 54 37 104 ---- Normal 91 55 33 118 Recorded 94 57 32 128 0.00 2008 90 54 25 117 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 75 APR 24 ; Min = 68.2 APR 19 WEATHER UPDATE -------------------------------- Expect warm weather across AZ this week. Partly cloudy & mild conditions Mon- day will give way to clearing skies & further warming for the rest of the week. Temperatures should average 3-5 degrees above normal this week. Long range forecasts suggest a trough of low pressure will move into the West for the weekend, but this system will likely be displaced too far north to have a major impact on AZ weather. Heat unit (HU) accumulation now exceeds 800 at most locations. Medium & shorter maturity varieties are recommended once HU accumul- tion exceeds 700. Cotton Development Advisories will be issued for all locations next week. BUCKEYE COTTON DEVELOPMENT ADVISORY MAY 3, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | v | | | | | | | | 3/15************ 601 +3 days | v | | | | | | | | 4/1 ******** 418 +2 days | v | | | | | | | | 4/15***** 268 +1 day | | | | | | | | | 5/1 24 +1 day | | | | | | | | | | 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 2 v = Heat Units on APR 25; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1073; Last year = 931 HUs since Jan 1 are running about 7 days ahead of normal. HU last week = 111 HISTORICAL STATISTICS -------------------------------- Last Week : APR 26 - MAY 2 This Week : MAY 3 - MAY 9 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 91 55 33 118 ---- Normal 92 57 34 125 Recorded 88 54 32 111 0.00 2008 91 55 27 122 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 29% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): .37" .37" .37" .37" .37" WEATHER UPDATE -------------------------------- High pressure will dominate AZ weather this week. Expect sunny & very warm temperatures with low humidity. Temperatures should exceed 100F in central & western production areas by mid-week. Temperatures are expected to peak on Thursday with only slight cooling forecast for the weekend. Temperatures will average 5-7 degrees above normal for the week. It is important to avoid water stress during early crop development. Water stress reduces plant vigor & causes square abortion. Growers should monitor soil moisture closely as the first post plant irrigation is typically needed when HU accumulation after planting totals between 700 & 900 (see graph). BUCKEYE COTTON DEVELOPMENT ADVISORY MAY 10, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | v | | | | | | | | 3/15*************** 760 +4 days | v | | | | | | | | 4/1 ************ 577 +3 days | v | | | | | | | | 4/15********* 427 +3 days | | | | | | | | | 5/1 **** 183 +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 MAY 9 v = Heat Units on MAY 2; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1232; Last year = 1052 HUs since Jan 1 are running about 9 days ahead of normal. HU last week = 160 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 3 - MAY 9 This Week : MAY 10 - MAY 16 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 92 57 34 125 ---- Normal 92 59 33 131 Recorded 99 64 39 160 0.00 2008 91 59 34 130 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 47% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): .47" .45" .45" .45" .45" WEATHER UPDATE -------------------------------- More hot & dry weather is expected this week. High pressure will again dom- inate AZ weather & produce sunny skies & very warm temperatures with low humidity. Daytime temperatures should average about 10 degrees above normal while nights will remain mild. Long range forecasts indicate even hotter weather will develop early next week. It is important to avoid water stress during early crop development. Water stress reduces plant vigor & causes square abortion. Growers should monitor soil moisture closely as the first post plant irrigation is typically needed when HU accumulation after planting totals between 700 & 900 (see graph). BUCKEYE COTTON DEVELOPMENT ADVISORY MAY 17, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | |v | | | | | | | 3/15****************** 919 +6 days | v | | | | | | | | 4/1 *************** 736 +5 days | v | | | | | | | | 4/15************ 586 +4 days | v | | | | | | | | 5/1 ******* 342 +5 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 16 v = Heat Units on MAY 9; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1391; Last year = 1182 HUs since Jan 1 are running about 9 days ahead of normal. HU last week = 158 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 10 - MAY 16 This Week : MAY 17 - MAY 23 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 92 59 33 131 ---- Normal 97 61 35 145 Recorded 101 63 35 158 0.00 2008 91 61 41 123 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 65% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 Water Use (last week): .72" .46" .46" .46" WEATHER UPDATE -------------------------------- Easterly flow will allow moisture to enter southeast & central AZ. Expect mostly sunny skies with hot temperatures & widely scattered afternoon thunderstorms. Most thunderstorms will develop in mountain areas, but a few may wander into lower elevations late in the day. Western AZ will remain hot & dry during most of the week. A trough of low pressure will pass across the Great Basin mid-week & bring some cooling & a return to dry conditions late in the week. Water stress reduces plant vigor & causes square abortion. The first post-plant irrigation is typically needed when HU accumulation after planting totals between 700 & 900 (see graph). BUCKEYE COTTON DEVELOPMENT ADVISORY MAY 24, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | v | | | | | | 3/15********************** 1095 +6 days | |v | | | | | | | 4/1 ****************** 912 +6 days | v | | | | | | | | 4/15*************** 762 +5 days | v | | | | | | | | 5/1 ********** 518 +6 days | | | | | | | | | 5/15**** 201 +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 MAY 23 v = Heat Units on MAY 16; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1567; Last year = 1305 HUs since Jan 1 are running about 9 days ahead of normal. HU last week = 177 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 17 - MAY 23 This Week : MAY 24 - MAY 30 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 97 61 35 145 ---- Normal 100 66 39 167 Recorded 97 71 51 177 0.16 2008 90 54 40 113 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): .88" .64" .44" .42" .42" WEATHER UPDATE -------------------------------- Warm & dry weather is expected across much of AZ this week. Expect a gradual warming trend with temperatures rising to above normal levels by the weekend. Some residual moisture from last week's unusual storm will remain across the eastern half of the state & may trigger a few widely scattered thunderstorms in southeast & central production areas. May & June are excellent months for cotton growth & development. Water stress should be avoided at this time of year as stress reduces plant vigor & square retention. The first post-plant irrigation is typically needed when HU accum- ulation after planting totals between 700 & 900 (see graph). BUCKEYE COTTON DEVELOPMENT ADVISORY MAY 31, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | v | | | | | | 3/15************************* 1260 +5 days | | v | | | | | | 4/1 ********************** 1077 +5 days | |v | | | | | | | 4/15******************* 927 +4 days | v | | | | | | | | 5/1 ************** 683 +5 days | v | | | | | | | | 5/15******* 366 +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 30 v = Heat Units on MAY 23; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1732; Last year = 1418 HUs since Jan 1 are running about 10 days ahead of normal. HU last week = 165 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 24 - MAY 30 This Week : MAY 31 - JUN 6 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 100 66 39 167 ---- Normal 98 64 36 155 Recorded 99 65 38 165 0.00 2008 99 61 31 149 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 91% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.18" .92" .7" .44" .44" WEATHER UPDATE -------------------------------- High pressure will produce warm & dry weather for most of the week. Expect clear skies with near normal temperatures & low humidity through Friday. Another slow moving storm system may move across the Southwest late this week, producing an increase in clouds & cooler temperatures. No preciptation is expected with this late spring storm system. The normal hot & dry June weather is optimal for fruit retention (FR). FR usually slumps once the humidity arrives during monsoon season. Growers are encouraged to take advantage of the upcoming June weather as forecasters are now indicating the monsoon will arrive early this year. BUCKEYE COTTON DEVELOPMENT ADVISORY JUN 7, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | |v | | | | | 3/15**************************** 1422 +6 days | | | v | | | | | | 4/1 ************************* 1239 +6 days | | |v | | | | | | 4/15********************** 1089 +5 days | v | | | | | | | 5/1 ***************** 845 +5 days | v | | | | | | | | 5/15*********** 528 +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 6 v = Heat Units on MAY 30; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1894; Last year = 1567 HUs since Jan 1 are running about 10 days ahead of normal. HU last week = 161 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 31 - JUN 6 This Week : JUN 7 - JUN 13 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 98 64 36 155 ---- Normal 98 64 37 159 Recorded 99 65 34 161 0.00 2008 104 66 35 171 PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 95% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.48" 1.21" .98" .62" .47" WEATHER UPDATE -------------------------------- Another late spring storm system will impact AZ early this week. Expect breezy conditions with scattered clouds & mild temperatures through mid-week. Precipita- tion may develop over central & eastern AZ on Tuesday with the passage of this system. High pressure will redevelop over AZ on Wednesday & produce warmer & drier conditions for the remainder of the week. The normal hot & dry June weather is optimal for fruit retention (FR). FR usually slumps once the humidity arrives during monsoon season. Growers are encouraged to take advantage of the upcoming June weather as forecasters are now indicating the monsoon will arrive early this year. BUCKEYE COTTON DEVELOPMENT ADVISORY JUN 14, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | v | | | | | 3/15******************************** 1576 +6 days | | | |v | | | | | 4/1 **************************** 1393 +6 days | | | v | | | | | | 4/15************************* 1243 +5 days | | v| | | | | | | 5/1 ******************** 999 +5 days | v | | | | | | | | 5/15************** 682 +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 13 v = Heat Units on JUN 6; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2048; Last year = 1738 HUs since Jan 1 are running about 8 days ahead of normal. HU last week = 155 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 7 - JUN 13 This Week : JUN 14 - JUN 20 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 98 64 37 159 ---- Normal 104 71 45 184 Recorded 93 64 39 155 0.00 2008 111 72 40 190 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.6" 1.34" 1.13" .79" .43" WEATHER UPDATE -------------------------------- The period of below normal temperatures will continue through at least mid-week due to the presence of a trough of low pressure off the CA coast. Expect mostly sunny skies with mild temperatures & moderate breezes through mid-week. High pressure may redevelop later in the week & cause temperatures to return to near normal levels. This warm up could be short-lived as another disturbance is fore- cast to produce another period of cooling for the weekend. The current flow pat- tern may produce a few scattered thunderstorms in high elevation areas of central & southeast AZ. BUCKEYE COTTON DEVELOPMENT ADVISORY JUN 28, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | v | | | | 3/15*************************************** 1927 +4 days | | | | v | | | | 4/1 *********************************** 1744 +4 days | | | | v | | | | | 4/15******************************** 1594 +3 days | | | v| | | | | | 5/1 *************************** 1350 +3 days | | v| | | | | | | 5/15********************* 1033 +1 day | | | | | | | | | | 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 27 v = Heat Units on JUN 20; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2399; Last year = 2122 HUs since Jan 1 are running about 7 days ahead of normal. HU last week = 184 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 21 - JUN 27 This Week : JUN 28 - JUL 4 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 104 73 49 189 ---- Normal 107 75 53 198 Recorded 104 71 46 184 0.00 2008 109 79 48 208 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.09" 1.84" 1.63" 1.28" .84" HEAT STRESS LEVELS -------------------------------- Date 6/21 6/22 6/23 6/24 6/25 6/26 6/27 Stress ns ns ns ns ns ns L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- The forecasted early monsoon for 2009 has become a reality. Expect increasing moisture across much of AZ through mid-week with a chance for afternoon & evening thunderstorms each day. Temperatures should moderate to normal levels with the arrival of this moisture. A drier, southwesterly flow is expectd to develop during the latter half of the week & bring a return to hotter & drier conditions by the weekend, especially across the western half of AZ. Some heat induced reductions in fruit retention are possible with this first surge of monsoon humidity. Heat stress conditions can be monitored online at http://ag.arizona.edu/azmet/data/00stress1.txt BUCKEYE COTTON DEVELOPMENT ADVISORY JUL 5, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | v | | | | 3/15******************************************* 2133 +4 days | | | | | v | | | | 4/1 *************************************** 1950 +4 days | | | | |v | | | | 4/15************************************ 1800 +3 days | | | | v | | | | | 5/1 ******************************* 1556 +4 days | | | v | | | | | | 5/15************************* 1239 +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 4 v = Heat Units on JUN 27; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2605; Last year = 2330 HUs since Jan 1 are running about 7 days ahead of normal. HU last week = 207 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 28 - JUL 4 This Week : JUL 5 - JUL 11 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 107 75 53 198 ---- Normal 102 75 61 194 Recorded 107 79 60 207 0.01 2008 104 77 58 200 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.39" 2.24" 2.01" 1.65" 1.18" HEAT STRESS LEVELS -------------------------------- Date 6/28 6/29 6/30 7/1 7/2 7/3 7/4 Stress L1 L1 L1 L1 L1 L1 L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Humidity levels will decrease this week as high pressure develops over Arizona. This high is expected to be very strong & current forecasts call record temper- atures across AZ late in the week. Rainfall will be confined to high elevation areas of eastern & southeastern AZ. The reduction in humidity should lessen the potential for severe heat stress conditions. However, growers should ensure that crops are well watered during this period. Water stress reduces square retention & may enhance problems with heat stress. Most central & western production areas experienced some heat stress last week. Heat stress conditions can be monitored online at http://ag.arizona.edu/azmet/data/00stress1.txt BUCKEYE COTTON DEVELOPMENT ADVISORY JUL 12, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | v | | | 3/15*********************************************** 2333 +4 days | | | | | v | | | | 4/1 ******************************************* 2150 +4 days | | | | | v | | | | 4/15**************************************** 2000 +4 days | | | | v | | | | 5/1 *********************************** 1756 +4 days | | | |v | | | | | 5/15***************************** 1439 +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 11 v = Heat Units on JUL 4; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2805; Last year = 2530 HUs since Jan 1 are running about 7 days ahead of normal. HU last week = 199 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 5 - JUL 11 This Week : JUL 12 - JUL 18 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 102 75 61 194 ---- Normal 106 77 55 200 Recorded 108 76 51 199 0.00 2008 106 79 66 204 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.42" 2.42" 2.33" 1.97" 1.49" HEAT STRESS LEVELS -------------------------------- Date 7/5 7/6 7/7 7/8 7/9 7/10 7/11 Stress L1 L1 L1 L1 ns ns L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- High pressure will remain in place over AZ this week, producing near record high temperatures & reduced levels of humidity. Long range forecasts suggest the heat could remain in place for much of the week. The reduction in humidity will help minimize problems with heat stress which were generally light last week. Growers should ensure that crops are well watered during this period. Water stress reduces square retention & may enhance problems with heat stress. Heat stress conditions can be monitored online at http://ag.arizona.edu/azmet/data/00stress1.txt BUCKEYE COTTON DEVELOPMENT ADVISORY JUL 19, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | v | | | 3/15*************************************************** 2545 +5 days | | | | | | v | | | 4/1 *********************************************** 2362 +5 days | | | | | v| | | | 4/15******************************************** 2212 +4 days | | | | | v | | | | 5/1 *************************************** 1968 +4 days | | | | v | | | | | 5/15********************************* 1651 +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 18 v = Heat Units on JUL 11; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3017; Last year = 2734 HUs since Jan 1 are running about 8 days ahead of normal. HU last week = 212 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 12 - JUL 18 This Week : JUL 19 - JUL 25 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 106 77 55 200 ---- Normal 105 77 60 200 Recorded 111 83 55 212 0.00 2008 106 79 62 206 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.57" 2.57" 2.57" 2.42" 1.92" HEAT STRESS LEVELS -------------------------------- Date 7/12 7/13 7/14 7/15 7/16 7/17 7/18 Stress L2 L2 L2 L1 L2 L2 L2 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- High pressure will remain in place over AZ for much of the week. Expect very hot temperatures, moderate humidity & widely scattered afternoon thunderstorms. Long range forecasts indicate the high may shift into New Mexico later in the week, resulting in cooler temperatures. Many areas in central & western AZ experienced Level 2 heat stress last week. Level 2 stress produces moderate to high rates of boll abortion & can damage young (15-day pre-bloom) squares which can produce a second period of poor fruit retention about 15 days after the heat stress event. Heat damaged squares often produce malformed flowers with little viable pollen & most bolls from such squares abort shortly after bloom. Heat stress conditions can be monitored online at http://ag.arizona.edu/azmet/data/00stress1.txt BUCKEYE COTTON DEVELOPMENT ADVISORY JUL 26, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | v | | | 3/15******************************************************* 2753 +5 days | | | | | | v | | | 4/1 *************************************************** 2570 +5 days | | | | | | v | | | 4/15************************************************ 2420 +4 days | | | | | v | | | | 5/1 ******************************************** 2176 +4 days | | | | | v | | | | 5/15************************************* 1859 +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 25 v = Heat Units on JUL 18; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3225; Last year = 2940 HUs since Jan 1 are running about 8 days ahead of normal. HU last week = 208 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 19 - JUL 25 This Week : JUL 26 - AUG 1 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 105 77 60 200 ---- Normal 104 77 62 201 Recorded 105 80 64 208 0.41 2008 108 77 54 203 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" 2.1" HEAT STRESS LEVELS -------------------------------- Date 7/19 7/20 7/21 7/22 7/23 7/24 7/25 Stress L2 L2 L1 L1 L1 L1 L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- The high pressure system responsible for the monsoon is forecast to move south into Mexico this week, shutting off most of the moisture. Expect very hot temp- eratures early in the week, followed by some slight cooling later in the week. Dew points will decrease which should allow for slightly cooler nights & less problems with heat stress. Heat stress continues to be a problem in many low desert production areas. Level 2 heat stress produces moderate to high rates of boll abortion & can damage young (15-day pre-bloom) squares which can produce a second period of poor fruit retention about 15 days after the heat stress event. For daily heat stress updates: http://ag.arizona.edu/azmet/data/00stress1.txt BUCKEYE COTTON DEVELOPMENT ADVISORY AUG 2, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | v | | 3/15*********************************************************** 2958 +5 days | | | | | | v | | | 4/1 ******************************************************** 2775 +5 days | | | | | | v | | | 4/15**************************************************** 2625 +4 days | | | | | | v | | | 5/1 ************************************************ 2381 +5 days | | | | | v | | | | 5/15***************************************** 2064 +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 1 v = Heat Units on JUL 25; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3430; Last year = 3143 HUs since Jan 1 are running about 8 days ahead of normal. HU last week = 206 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 26 - AUG 1 This Week : AUG 2 - AUG 8 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 104 77 62 201 ---- Normal 107 77 60 202 Recorded 108 79 54 206 0.00 2008 104 79 53 204 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 7/26 7/27 7/28 7/29 7/30 7/31 8/1 Stress L1 L2 L2 L1 L1 ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- A weak to moderate monsoon flow regime is expected through mid-week. Expect hot temperatures, moderate humidity and isolated thunderstorms in most production areas through Wednesday. A Pacific trough is forecast to move inland across the Great Basin late in the week reducing temperatures, humidity & the chances for precipitation. Temperatures should return to normal levels by the weekend. Last week's dry weather reduced heat stress conditions across central & western AZ. Fruit retention often recovers during these less stressful periods, provided the area has not endured extended periods of L2 stress. L2 stress can damage young squares & produce periods of poor fruit retention once these squares develop into flowers (even when weather conditions are optimal). BUCKEYE COTTON DEVELOPMENT ADVISORY AUG 9, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | v | | 3/15*************************************************************** 3153 +5 days | | | | | | | v | | 4/1 *********************************************************** 2970 +5 days | | | | | | v| | | 4/15******************************************************** 2820 +4 days | | | | | | v | | | 5/1 **************************************************** 2576 +5 days | | | | | v | | | 5/15********************************************* 2259 +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 8 v = Heat Units on AUG 1; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3625; Last year = 3347 HUs since Jan 1 are running about 8 days ahead of normal. HU last week = 196 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 2 - AUG 8 This Week : AUG 9 - AUG 15 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 107 77 60 202 ---- Normal 104 76 62 198 Recorded 107 75 47 196 0.00 2008 104 79 62 204 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.26" 2.39" 2.39" 2.39" 2.39" HEAT STRESS LEVELS -------------------------------- Date 8/2 8/3 8/4 8/5 8/6 8/7 8/8 Stress L1 L1 L2 L2 L1 ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Another sunny & hot week is on tap for much of AZ. Expect sunny skies with hot days, mild evenings & low humidity through Wednesday. A weak to moderate monsoon flow will redevelop during the latter half of the week, bringing a return to mod- erate humidity levels in southeastern & central AZ. Isolated afternoon & evening thunderstorms are possible in these regions Wednesday through Friday. Another trough of low pressure is expected to move inland from the Pacific this weekend, bringing a return to dry southwesterly flow. The recent dry weather has greatly reduced heat stress conditions. Fruit retention should improve during these dry periods provided the crop is not already in cutout. BUCKEYE COTTON DEVELOPMENT ADVISORY AUG 16, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | v | | 3/15******************************************************************* 3343 +5 days | | | | | | | v | | 4/1 *************************************************************** 3160 +4 days | | | | | | | v | | 4/15************************************************************ 3010 +4 days | | | | | | v| | | 5/1 ******************************************************* 2766 +4 days | | | | | | v | | | 5/15************************************************* 2449 +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 15 v = Heat Units on AUG 8; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3815; Last year = 3551 HUs since Jan 1 are running about 8 days ahead of normal. HU last week = 190 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 9 - AUG 15 This Week : AUG 16 - AUG 22 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 104 76 62 198 ---- Normal 105 78 62 203 Recorded 104 73 52 190 0.11 2008 106 77 61 199 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.86" 2.09" 2.22" 2.22" 2.22" HEAT STRESS LEVELS -------------------------------- Date 8/9 8/10 8/11 8/12 8/13 8/14 8/15 Stress ns ns L1 L1 ns L1 ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Southwesterly flow will continue through mid-week, resulting in hot days, mild nights & very low humidity for this time of year. More typical monsoon weather will redevelop during the latter half of the week with cooler temperatures, higher humidity & increased chances for isolated afternoon & evening thunder- storms. The recent streak of unusually dry August weather has greatly reduced heat stress conditions in central & western production areas. Fruit retention should improve during these dry periods if the crop is not already in cutout. BUCKEYE COTTON DEVELOPMENT ADVISORY AUG 23, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | | v 3532 | 3/15*********************************************************************** +4 days | | | | | | | v | | 4/1 ******************************************************************* 3349 +4 days | | | | | | | v | | 4/15**************************************************************** 3199 +3 days | | | | | | | v | | 5/1 *********************************************************** 2955 +4 days | | | | | | v | | | 5/15***************************************************** 2638 +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 22 v = Heat Units on AUG 15; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 4004; Last year = 3750 HUs since Jan 1 are running about 8 days ahead of normal. HU last week = 189 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 16 - AUG 22 This Week : AUG 23 - AUG 29 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 105 78 62 203 ---- Normal 103 76 61 195 Recorded 104 72 52 189 0.60 2008 100 73 57 191 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.55" 1.77" 1.95" 2.12" 2.12" HEAT STRESS LEVELS -------------------------------- Date 8/16 8/17 8/18 8/19 8/20 8/21 8/22 Stress ns ns ns ns L1 L1 ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Another in a series of unusual late summer troughs will move across AZ early this week, ending the brief period of enhanced humidity experienced over the past few days. Isolated thunderstorms are possible in central & eastern pro- duction areas with the passage of this system. High pressure will build over the state later in the week & bring a return to very hot temperatures with much lower humidity. The monsoon's next possible impact will be this coming weekend when moisture may again leak into AZ. The publication entitled "Boll Maturity Dates for Late Season Cotton Flowers" has been revised and is available at http://ag.arizona.edu/azmet/cotton.htm. BUCKEYE COTTON DEVELOPMENT ADVISORY AUG 30, 2009 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | | 3726 | 3/15**************************************************************************+5 days | | | | | | | | v 3543 | 4/1 *********************************************************************** +4 days | | | | | | | v| | 4/15******************************************************************** 3393 +4 days | | | | | | | v | | 5/1 *************************************************************** 3149 +4 days | | | | | | v | | 5/15********************************************************* 2832 +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 29 v = Heat Units on AUG 22; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 4198; Last year = 3941 HUs since Jan 1 are running about 8 days ahead of normal. HU last week = 195 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 23 - AUG 29 This Week : AUG 30 - SEP 5 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 103 76 61 195 ---- Normal 101 71 57 183 Recorded 107 74 55 195 0.00 2008 102 72 70 188 ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.37" 1.6" 1.78" 2.08" 2.2" HEAT STRESS LEVELS -------------------------------- Date 8/23 8/24 8/25 8/26 8/27 8/28 8/29 Stress L1 ns L1 ns L1 L1 L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Monsoon flow will return this week, resulting in cooler temperatures, higher humidity & a chance for afternoon & evening thunderstorms each day. A hurricane is presently moving up the west coast of Mexico & is expected to produce even cooler temperatures & an additional surge of humidity late in the week. The rem- nants of this hurricane could produce a significant precipitation event over parts of AZ later this week. NOTE: The publication "Boll Maturity Dates for Late Season Cotton Flowers" is available at http://ag.arizona.edu/azmet/cotton.htm. This is the final 2009 Advisory. Feedback regarding this program is appreciated & should be sent to pbrown@ag.arizona.edu. Have a safe & profitable harvest season!