PINAL COUNTY MAR 20, 2011 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 19 v = Heat Units accumulated from JAN 1 - MAR 12 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 2 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 13 - MAR 19 This Week : MAR 20 - MAR 26 HIGH LOW DEWPT HUs HIGH LOW DEWPT HUs Normal 77 44 34 60 Normal 80 46 34 68 Recorded 86 45 36 88 2010 75 41 36 48 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 63 MAR 17 ; Min = 58.1 MAR 13 Last Week's Rain : Maricopa = 0 " Coolidge = 0 " WEATHER UPDATE -------------------------------- A storm system will pass through AZ on Monday & Tuesday, resulting in windy & much cooler weather with a chance for precipitation. The chances for significant precipitation are highest in central & western production areas. Drier weather will return by mid-week, but temperatures will warm slowly, approaching normal by late in the week. Acceptable germination typically results when minimum soil temperatures (~8am) are 60F or higher. This usually occurs when air temperatures exceed 80F during the afternoon & remain above 48F at night. Seed is most sensitive to cold during the first 24 hours after planting. Avoid planting into cold soils! PINAL COUNTY MAR 27, 2011 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ********************** | ********* 449 ******** | ********************** | | ^ 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 26 v = Heat Units accumulated from JAN 1 - MAR 19 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 1 day behind normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 20 - MAR 26 This Week : MAR 27 - APR 2 HIGH LOW DEWPT HUs HIGH LOW DEWPT HUs Normal 80 46 34 68 Normal 76 45 34 59 Recorded 73 41 36 42 2010 79 42 30 62 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 63 MAR 21 ; Min = 52.9 MAR 26 Last Week's Rain : Maricopa = .05 " Coolidge = .09 " WEATHER UPDATE -------------------------------- High pressure will dominate AZ weather conditions this week. Expect sunny & very dry weather with much warmer temperatures. Daytime highs will warm a few degrees each day & approach record levels late in the week. Several storm systems are expected to pass north of AZ this week producing some periods of windy weather. Full season varieties should be planted before the annual accumulation of heat units (CHUs) exceeds 700 & preferably before CHU exceeds 600 (see graph above). Soils warm to acceptable levels for germination when daytime highs exceed 80F & lows remain above 48F. Seed is most sensitive to cold during the first 24 hours after planting. Avoid planting into cold soils! PINAL COUNTY APR 3, 2011 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | *************************** | ************ 545 ********** | *************************** | | ^ 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 2 v = Heat Units accumulated from JAN 1 - MAR 26 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 3 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAR 27 - APR 2 This Week : APR 3 - APR 9 HIGH LOW DEWPT HUs HIGH LOW DEWPT HUs Normal 76 45 34 59 Normal 82 48 34 78 Recorded 88 48 30 95 2010 82 44 30 74 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 68 APR 2 ; Min = 53.6 MAR 27 Last Week's Rain : Maricopa = 0 " Coolidge = 0 " WEATHER UPDATE -------------------------------- Current forecasts call for an unsettled week of weather. Sunny & mild conditions will prevail through Tuesday. A storm system will pass through the region mid- week resulting in increased winds, cooler temperatures & a chance for precipita- tion. A second system is expected to impact the region this weekend resulting in another chance for precipitation & even cooler temperatures. Full season varieties should be planted before the annual accumulation of heat units exceeds 600 & no later than 700 (see graph). Soils warm to acceptable lev- els for germination when daytime highs exceed 80F & lows stay above 48F. Seed is most sensitive to cold the 1st day after planting. Avoid planting in cold soils! PINAL COUNTY APR 10, 2011 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ******************************* | ************** 622 ************ | ******************************* | | ^ 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 9 v = Heat Units accumulated from JAN 1 - APR 2 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 3 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 3 - APR 9 This Week : APR 10 - APR 16 HIGH LOW DEWPT HUs HIGH LOW DEWPT HUs Normal 82 48 34 78 Normal 84 48 30 85 Recorded 78 51 30 77 2010 84 46 31 86 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 69.6 APR 3 ; Min = 60.8 APR 9 Last Week's Rain : Maricopa = .32 " Coolidge = .64 " WEATHER UPDATE -------------------------------- Expect a return to normal or above normal temperatures this week. High pressure will return Monday, leading to sunny & dry conditions & a quick return to normal temperatures. A storm system is forecast to move across the Great Basin Wednes- day. This system is not expected to produce precipitation, but may produce some windy conditions & a few degrees of cooling. High pressure will redevelop late in the week & bring a return to clear skies & above normal temperatures. Full season varieties should be planted before the annual accumulation of heat units exceeds 600 & no later than 700 (see graph). Soils warm to acceptable lev- els for germination when daytime highs exceed 80F & lows stay above 48F. PINAL COUNTY APR 17, 2011 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | *********************************** | **************** 694 ************** | *********************************** | | ^ 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 16 v = Heat Units accumulated from JAN 1 - APR 9 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 1 day ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 10 - APR 16 This Week : APR 17 - APR 23 HIGH LOW DEWPT HUs HIGH LOW DEWPT HUs Normal 84 48 30 85 Normal 86 51 34 99 Recorded 81 44 31 72 2010 79 49 38 74 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 64.2 APR 14 ; Min = 51.6 APR 10 Last Week's Rain : Maricopa = 0 " Coolidge = 0 " WEATHER UPDATE -------------------------------- A series of storm systems will move through the Great Basin this week, producing breezy weather, but only minor changes in temperature. Expect sunny skies, low humidity & above normal temperatures with little chance for precipitation. Full season varieties should be planted before the annual accumulation of heat units exceeds 600 & no later than 700 (see graph). Plant population should run between 25,000-50,000 plants/acre. A quick way to check population is to count the number of plants in 1/1000 of an acre, then multiply by 1000. Row lengths associated with 1/1000 acre are: 40" rows = 13'1"; 38" rows = 13'9"; 36" rows = 14'6" and 30" rows = 17'5". PINAL COUNTY APR 24, 2011 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ***************************************** | ****************** 813 ****************** | ***************************************** | | ^ 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 23 v = Heat Units accumulated from JAN 1 - APR 16 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 3 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 17 - APR 23 This Week : APR 24 - APR 30 HIGH LOW DEWPT HUs HIGH LOW DEWPT HUs Normal 86 51 34 99 Normal 88 53 33 106 Recorded 91 55 38 119 2010 83 49 36 86 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 69.8 APR 21 ; Min = 61.3 APR 23 Last Week's Rain : Maricopa = 0 " Coolidge = 0 " WEATHER UPDATE -------------------------------- High pressure will build over the Southwest this week, resulting clear skies, & a gradual warming trend. Expect periods of breezy weather as storm systems pass north of AZ. Temperatures should warm to 5-10F above normal by Thurday. Full season varieties should be planted as soon as possible. Medium & shorter maturity varieties are better suited for May planting dates (see graph). Plant population should run between 25,000-50,000 plants/acre. A quick way to check population is to count the number of plants in 1/1000 of an acre, then multiply by 1000. Row lengths equal to 1/1000 acre are: 40"rows = 13'1"; 38"rows = 13'9"; 36"rows = 14'6" and 30"rows = 17'5". PINAL COUNTY MAY 1, 2011 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | ********************************************** | ********************* 923 ******************** | ********************************************** | | ^ 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 30 v = Heat Units accumulated from JAN 1 - APR 23 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 3 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : APR 24 - APR 30 This Week : MAY 1 - MAY 7 HIGH LOW DEWPT HUs HIGH LOW DEWPT HUs Normal 88 53 33 106 Normal 91 54 32 118 Recorded 87 55 36 109 2010 90 49 27 108 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 70.3 APR 29 ; Min = 66.4 APR 24 Last Week's Rain : Maricopa = 0 " Coolidge = 0 " WEATHER UPDATE -------------------------------- High pressure will intensify this week, producing very warm & dry conditions. Temperatures should average ~10F above normal by mid-week. Some cooling is pos- sible this weekend as a storm system passes through the central Rockies. Weather conditions over the past 3 weeks have generally been good for germination. Plant population should range from 25,000-50,000 plants/acre. To check plant pop- ulation count the plants in 1/1000 of an acre, then multiply by 1000. Row lengths equal to 1/1000 acre are: 40"rows=13'1"; 38"rows=13'9"; 36"rows=14'6" & 30"rows= 17'5". Pinhead square (PHS) is an important developmental stage for young cotton. First PHSs typically form on nodes 5 through 7 at ~700 heat units after planting. PINAL COUNTY MAY 8, 2011 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | PINK BOLLWORM SUSCEPTIBILITY * | +---------+------------+-----------------------------------------+ | | HIGH | MEDIUM | LOW | | | v | **************************************************** | *********************** 1033 *********************** | **************************************************** | | ^ 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 7 v = Heat Units accumulated from JAN 1 - APR 30 * HIGH:>50%, MEDIUM:25-50%, LOW<25% Spring Emergence after Susceptible Square HEAT UNITS -------------------------------- HUs are running about 2 days ahead of normal. HISTORICAL STATISTICS -------------------------------- Last Week : MAY 1 - MAY 7 This Week : MAY 8 - MAY 14 HIGH LOW DEWPT HUs HIGH LOW DEWPT HUs Normal 91 54 32 118 Normal 94 58 34 130 Recorded 92 51 27 110 2010 86 51 30 100 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 72.5 MAY 7 ; Min = 64.2 MAY 2 Last Week's Rain : Maricopa = 0 " Coolidge = 0 " WEATHER UPDATE -------------------------------- A strong late spring storm system will pass through Northern AZ early this week. Expect windy conditions with low humidity & much cooler temperatures through Tuesday. No rainfall is expected with this system. High pressure will redevelop over AZ on Wednesday & produce much warmer temperatures by the weekend. Pinhead square (PHS) represents an important early season developmental stage for young cotton. First PHSs typically form on nodes 5 through 7 at ~700 heat units after planting. Split applications of nitrogen (N) fertilizer are recom- mended for cotton with initial applications often applied around PHS. For more on N management see http://cals.arizona.edu/pubs/crops/az1243.pdf PINAL COUNTY COTTON DEVELOPMENT ADVISORY MAY 22, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | v | | | | | | | 3/15****************** 890 0 days | v | | | | | | | | 4/1 ************** 719 -1 day | v | | | | | | | | 4/15*********** 563 -1 day | v | | | | | | | | 5/1 ****** 311 -2 days | | | | | | | | | 5/15** 83 -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 21 v = Heat Units on MAY 14; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1244; Last year = 1082; Normal = 1267 HUs since Jan 1 are running about normal. HU last week = 102 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 15 - MAY 21 This Week : MAY 22 - MAY 28 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 85 55 102 34 2010 90 52 29 110 RAIN : Maricopa = 0 " Coolidge = .04 " PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 48% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): .66" .43" .43" .43" .43" WEATHER UPDATE -------------------------------- A storm system will pass through the central Rockies early this week, resulting in windy, dry and slightly cooler conditions Monday & Tuesday. High pressure will develop over AZ by mid-week & produce very warm & above normal temperatures by week's end. The period from mid-May through late June is prime time for cotton development in much of AZ. It is important to avoid water stress at this time of year. Water stress reduces growth & leads to square abortion. For fields planted into moisture the first post-plant irrigation is often applied between 700 & 1200 heat units after planting (HUAP) with an optimum window at 800-1000 HUAP. For more details see publication at http://cals.arizona.edu/pubs/crops/az1204.pdf PINAL COUNTY COTTON DEVELOPMENT ADVISORY MAY 29, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | v | | | | | | 3/15******************** 1025 0 days | v | | | | | | | 4/1 ***************** 854 -1 day | v | | | | | | | | 4/15************** 698 -1 day | v | | | | | | | | 5/1 ********* 446 -2 days |v | | | | | | | | 5/15**** 218 -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 28 v = Heat Units on MAY 21; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1379; Last year = 1192; Normal = 1408 HUs since Jan 1 are running about normal. HU last week = 135 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 22 - MAY 28 This Week : MAY 29 - JUN 4 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 96 57 135 31 2010 100 59 30 148 RAIN : Maricopa = 0 " Coolidge = 0 " PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 64% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): .99" .71" .51" .51" .51" WEATHER UPDATE -------------------------------- The cooler weekend weather will be short-lived. High pressure will develop over AZ this week, bringing a return to hot & dry conditions. Temperatures should run above normal through Wednesday, then cool back to normal levels late in the week. Winds will increase late in the week as a pair of storm systems pass through the central Rockies. Evaporative demand should run above normal this week. It is im- portant to avoid water stress at this time of year. Water stress reduces growth & leads to square abortion. The first post-plant irrigation for fields planted into moisture is typically applied between 700 & 1200 heat units after planting with an optimum window at 800-1000 heat units after planting. For more details see publication at http://cals.arizona.edu/pubs/crops/az1204.pdf PINAL COUNTY COTTON DEVELOPMENT ADVISORY JUN 5, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | v | | | | | | 3/15*********************** 1153 -1 day | | v| | | | | | | 4/1 ******************** 982 -2 days | v | | | | | | | 4/15***************** 826 -1 day | v | | | | | | | | 5/1 *********** 574 -2 days | v | | | | | | | | 5/15******* 346 -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 4 v = Heat Units on MAY 28; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1507; Last year = 1340; Normal = 1557 HUs since Jan 1 are running about 1 day behind normal. HU last week = 128 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 29 - JUN 4 This Week : JUN 5 - JUN 11 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 95 55 128 26 2010 102 68 40 171 RAIN : Maricopa = 0 " Coolidge = 0 " PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 77% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.08" .83" .6" .46" .46" WEATHER UPDATE -------------------------------- High pressure will continue to dominate AZ weather this week. Expect sunny, hot & dry weather with moderate afternoon winds. Some moisture moved into far south- east AZ over the weekend, but this moisture is expected to dissipate early in the week without producing significant precipitation. Expect temperatures to run near normal this week. Early season developmental stages can be predicted using heat unit accumulation after planting (HUAP). First pinhead squares typically develop at ~700 HUAP; susceptible squares at ~900 HUAP; & first flowers at ~1200 HUAP. Closely monitor soil moisture & avoid water stress. Water stress often leads to square abortion. PINAL COUNTY COTTON DEVELOPMENT ADVISORY JUN 12, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | v| | | | | | 3/15************************** 1299 -1 day | | | v | | | | | | 4/1 *********************** 1128 -1 day | | v| | | | | | | 4/15******************* 972 -1 day | v | | | | | | | | 5/1 ************** 720 -2 days | v | | | | | | | | 5/15********** 492 -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 11 v = Heat Units on JUN 4; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1653; Last year = 1511; Normal = 1711 HUs since Jan 1 are running about 1 day behind normal. HU last week = 146 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 5 - JUN 11 This Week : JUN 12 - JUN 18 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 98 60 146 30 2010 102 62 38 158 RAIN : Maricopa = 0 " Coolidge = 0 " PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 87% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.38" 1.11" .86" .49" .49" WEATHER UPDATE -------------------------------- High pressure will remain in place over AZ this week, resulting in sunny weather with hot days & mild evenings. Humidity will remain very low & winds will remain relatively light through mid-week. Expect higher winds late in the week as a storm system passes through the Great Basin. Closely monitor soil moisture & avoid water stress. Water use increases rapidly at this time of year due to high evaporative demand & rapid canopy growth. Early season developmental stages can be predicted using heat unit accummulation after planting (HUAP). First pinhead squares typically develop at ~700 HUAP; suscept- ible squares at ~900 HUAP; & first flowers at ~1200 HUAP (see graph above). PINAL COUNTY COTTON DEVELOPMENT ADVISORY JUN 19, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | v | | | | | 3/15***************************** 1464 0 days | | | v| | | | | | 4/1 ************************** 1293 -1 day | | |v | | | | | | 4/15*********************** 1137 -1 day | v | | | | | | | 5/1 ****************** 885 -2 days | v | | | | | | | | 5/15************* 657 -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 18 v = Heat Units on JUN 11; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1818; Last year = 1669; Normal = 1875 HUs since Jan 1 are running about 1 day behind normal. HU last week = 164 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 12 - JUN 18 This Week : JUN 19 - JUN 25 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 104 65 164 33 2010 106 66 32 172 RAIN : Maricopa = 0 " Coolidge = 0 " PINK BOLLWORM EMERGENCE -------------------------------- Spring emergence of PBW should be about 94% complete at this time. ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.78" 1.48" 1.21" .78" .54" WEATHER UPDATE -------------------------------- High pressure will intensify this week & produce the hottest temperatures of the 2011 season (to date). Expect less wind, but continued high rates of water use due to high temperatures, low humidity and rapid canopy development. Some trop- ical moisture is forecast to move northward toward AZ late this week. However, forecasters don't expect any precipitation. Current 6-14 day forecasts show a bias toward below normal precipitation (through 3 July). Longer range forecasts for July through September indicate a strong bias for above normal temperatures. Monitor soil moisture & avoid water stress. Water stress often leads to square abortion -- something to be avoided with a crop that is running behind normal. PINAL COUNTY COTTON DEVELOPMENT ADVISORY JUN 26, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | v | | | | | 3/15********************************* 1638 0 days | | | | v | | | | | 4/1 ***************************** 1467 -1 day | | | v| | | | | | 4/15************************** 1311 -1 day | | v | | | | | | 5/1 ********************* 1059 -2 days | v| | | | | | | | 5/15***************** 831 -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 25 v = Heat Units on JUN 18; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1992; Last year = 1841; Normal = 2048 HUs since Jan 1 are running about 1 day behind normal. HU last week = 174 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 19 - JUN 25 This Week : JUN 26 - JUL 2 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 106 67 174 40 2010 108 74 44 194 RAIN : Maricopa = 0 " Coolidge = 0 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.06" 1.76" 1.5" 1.07" .67" HEAT STRESS LEVELS -------------------------------- Date 6/19 6/20 6/21 6/22 6/23 6/24 6/25 Stress ns ns ns ns ns ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Intense high pressure will dominate AZ weather early this week, producing hot temperatures & low humidity. A storm system will drop into the central Rockies mid-week & generate an uptick in winds & humidity with some slight cooling. Current forecasts indicate the humidity will mostly impact the eastern third of the state. While a brief period of lower humidity will follow this system, long range forecasts indicate monsoon circulation will develop by this weekend. It is unclear at this time whether the mid-week & weekend humidity will be sufficient to produce heat stress conditions in central & western production areas. Growers are encouraged to closely monitor soil moisture & avoid water stress. PINAL COUNTY COTTON DEVELOPMENT ADVISORY JUL 3, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | v | | | | 3/15************************************ 1824 0 days | | | | v | | | | | 4/1 ********************************* 1653 0 days | | | | v | | | | | 4/15****************************** 1497 0 days | | | v | | | | | | 5/1 ************************* 1245 -1 day | | v| | | | | | | 5/15******************** 1017 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 JUL 2 v = Heat Units on JUN 25; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2178; Last year = 2035; Normal = 2230 HUs since Jan 1 are running about normal. HU last week = 187 HISTORICAL STATISTICS -------------------------------- Last Week : JUN 26 - JUL 2 This Week : JUL 3 - JUL 9 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 110 71 187 48 2010 106 74 45 190 RAIN : Maricopa = 0 " Coolidge = 0 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.24" 1.96" 1.71" 1.3" .93" HEAT STRESS LEVELS -------------------------------- Date 6/27 6/28 6/29 6/30 7/1 7/2 7/3 Stress ns ns L1 ns ns ns L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Monsoon moisture surged into AZ late last week ending the very hot & dry early summer weather. Moisture was sufficient to generate afternoon & evening thunder- storms across much of the state. Heat stress developed in central & western pro- duction areas with L2 stress reported in Yuma Valley. Moisture will remain in place much of the week. Expect afternoon & evening thunderstorms & near normal temperatures through Thursday. The monsoon high is forecast to shift eastward later in the week & may allow western production areas to dry out this weekend. Temperatures will return to above normal with these drier conditions. Daily up- dates on heat stress at http://ag.arizona.edu/azmet/data/00stress1.txt PINAL COUNTY COTTON DEVELOPMENT ADVISORY JUL 10, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | v | | | | 3/15**************************************** 2024 +1 day | | | | | v | | | | 4/1 ************************************* 1853 0 days | | | | v| | | | | 4/15********************************** 1697 0 days | | | |v | | | | | 5/1 ***************************** 1445 0 days | | | v | | | | | | 5/15************************ 1217 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 JUL 9 v = Heat Units on JUL 2; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2378; Last year = 2225; Normal = 2416 HUs since Jan 1 are running about 1 day ahead of normal. HU last week = 200 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 3 - JUL 9 This Week : JUL 10 - JUL 16 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 104 77 200 62 2010 108 80 58 208 RAIN : Maricopa = .13 " Coolidge = .02 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.56" 2.28" 2.03" 1.62" 1.25" HEAT STRESS LEVELS -------------------------------- Date 7/3 7/4 7/5 7/6 7/7 7/8 7/9 Stress L1 L1 L1 ns L1 L1 L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Isolated showers will continue early in the week across central and southern Arizona as a low pressure system moves through the area. This will also result in much cooler temperatures with afternoon highs only forecast to reach the mid-90s in central Arizona. Much drier air will move into the state by mid-week causing temperatures to increase back up to normal levels by the end of the week. This will also lessen the chance of precipitation by the weekend. The Colorado River area and western Arizona will remain mostly hot and dry throughout the week. PINAL COUNTY COTTON DEVELOPMENT ADVISORY JUL 17, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | v| | | | 3/15******************************************** 2201 +1 day | | | | | v | | | | 4/1 ***************************************** 2030 0 days | | | | | v | | | | 4/15************************************* 1874 0 days | | | | v | | | | | 5/1 ******************************** 1622 -1 day | | | v | | | | | 5/15**************************** 1394 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 JUL 16 v = Heat Units on JUL 9; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2555; Last year = 2433; Normal = 2602 HUs since Jan 1 are running about normal. HU last week = 176 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 10 - JUL 16 This Week : JUL 17 - JUL 23 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 101 69 176 49 2010 103 79 62 204 RAIN : Maricopa = .23 " Coolidge = .01 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.37" 2.34" 2.11" 1.74" 1.41" HEAT STRESS LEVELS -------------------------------- Date 7/10 7/11 7/12 7/13 7/14 7/15 7/16 Stress ns ns ns ns ns ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Monsoon moisture has returned to much of AZ. Current forecasts indicate this moisture will remain in place through mid-week in central & western AZ, then be replaced by a much drier southwest flow by Thursday. Moisture will remain across southeast AZ for the entire week. For central & western production areas: expect near normal temperatures with scattered afternoon thunderstorms through mid-week, then hot & dry late in the week. For southeast production areas: expect near normal temperatures with a chance for afternoon & evening thunderstorms each day. Heat stress (HS) was non-existent last week & total seasonal HS is running below normal. For HS updates go to http://ag.arizona.edu/azmet/data/00stress1.txt. PINAL COUNTY COTTON DEVELOPMENT ADVISORY JUL 24, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | v | | | 3/15************************************************ 2401 +1 day | | | | | v | | | 4/1 ********************************************* 2230 +1 day | | | | | v | | | | 4/15***************************************** 2074 +1 day | | | | |v | | | | 5/1 ************************************ 1822 0 days | | | | v | | | | | 5/15******************************** 1594 +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 JUL 23 v = Heat Units on JUL 16; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2755; Last year = 2637; Normal = 2790 HUs since Jan 1 are running about 1 day ahead of normal. HU last week = 200 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 17 - JUL 23 This Week : JUL 24 - JUL 30 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 106 77 200 58 2010 100 78 66 199 RAIN : Maricopa = 0 " Coolidge = 0 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.58" 2.58" 2.58" 2.2" 1.84" HEAT STRESS LEVELS -------------------------------- Date 7/17 7/18 7/19 7/20 7/21 7/22 7/23 Stress ns L1 L1 L1 L1 L1 L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- High levels of humidity will remain in place early this week, providing a decent chance for afternoon & evening thunderstorms through Tuesday. Drier southwest flow is expected by mid-week, resulting in warmer temperatures & less chance for precipitation Wednesday through Friday. Another influx of humidity is expected this weekend. Heat stress (HS) is running well below normal this growing season due to cooler temperatures & lower humidity. Growers can obtain daily updates on HS conditions via the AZMET website (http://ag.arizona.edu/azmet/data/00stress1.txt). PINAL COUNTY COTTON DEVELOPMENT ADVISORY JUL 31, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | v | | | 3/15**************************************************** 2599 +2 days | | | | | | v | | | 4/1 ************************************************* 2428 +1 day | | | | | v | | | 4/15********************************************* 2272 +1 day | | | | | v | | | | 5/1 **************************************** 2020 +1 day | | | | |v | | | | 5/15************************************ 1792 +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 JUL 30 v = Heat Units on JUL 23; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 2953; Last year = 2836; Normal = 2978 HUs since Jan 1 are running about 1 day ahead of normal. HU last week = 198 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 24 - JUL 30 This Week : JUL 31 - AUG 6 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 102 76 198 62 2010 102 74 64 192 RAIN : Maricopa = .08 " Coolidge = 0 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.2" 2.2" 2.2" 2.15" 1.84" HEAT STRESS LEVELS -------------------------------- Date 7/24 7/25 7/26 7/27 7/28 7/29 7/30 Stress L1 ns L1 ns L1 L1 L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Warm, humid weather & the remnants of tropical storm Don should produced a good chance for afternoon & evening thunderstorms through Tuesday. Drier air & hotter temperatures are forecast to move into AZ once TS Don departs. The drier air should lessen heat stress (HS) levels in lower elevation production areas which have experienced some L2 stress in recent days. Higher humidity & slightly cool- er temperatures are forecast to return by the weekend. HS updates are available at http://ag.arizona.edu/azmet/data/00stress1.txt. For more information on HS see: http://ag.arizona.edu/azmet/az1448.pdf. PINAL COUNTY COTTON DEVELOPMENT ADVISORY AUG 7, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | v| | | 3/15******************************************************** 2800 +2 days | | | | | | v | | | 4/1 ***************************************************** 2629 +2 days | | | | | | v | | | 4/15************************************************* 2473 +2 days | | | | | v| | | | 5/1 ******************************************** 2221 +1 day | | | | | v | | | | 5/15**************************************** 1993 +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 6 v = Heat Units on JUL 30; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3154; Last year = 3028; Normal = 3170 HUs since Jan 1 are running about 2 days ahead of normal. HU last week = 202 HISTORICAL STATISTICS -------------------------------- Last Week : JUL 31 - AUG 6 This Week : AUG 7 - AUG 13 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 106 77 202 63 2010 105 74 59 194 RAIN : Maricopa = .04 " Coolidge = .22 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.33" 2.33" 2.33" 2.33" 2.24" HEAT STRESS LEVELS -------------------------------- Date 7/31 8/1 8/2 8/3 8/4 8/5 8/6 Stress L1 L1 L1 L1 L1 L1 L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Hot & humid weather is on tap for much AZ this week. However, the flow regime may limit thunderstorm development to high elevation areas (mountains & south- east AZ). Dry, southwest flow associated with a trough off the Pacific coast may keep northwest production areas (Parker, Mohave) dry & stress free. Heat stress may be a problem in other low elevation production areas. A flow regime more conducive to thunderstorm activity is forecast to develop this weekend. Heat stress (HS) continues to run below normal levels for the growing season. HS updates are available at http://ag.arizona.edu/azmet/data/00stress1.txt. PINAL COUNTY COTTON DEVELOPMENT ADVISORY AUG 14, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | v | | 3/15************************************************************ 3003 +3 days | | | | | | v | | 4/1 ********************************************************* 2832 +2 days | | | | | | v | | | 4/15****************************************************** 2676 +2 days | | | | | | v | | | 5/1 ************************************************ 2424 +2 days | | | | | v| | | | 5/15******************************************** 2196 +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 13 v = Heat Units on AUG 6; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3357; Last year = 3222; Normal = 3358 HUs since Jan 1 are running about 3 days ahead of normal. HU last week = 204 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 7 - AUG 13 This Week : AUG 14 - AUG 20 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 101 79 204 64 2010 104 76 62 198 RAIN : Maricopa = 0 " Coolidge = 0 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 2.07" 2.07" 2.07" 2.07" 2.07" HEAT STRESS LEVELS -------------------------------- Date 8/7 8/8 8/9 8/10 8/11 8/12 8/13 Stress L1 L1 L1 L1 L1 ns L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- Drier southwest flow is expected over central & western production areas during the first half of the week, resulting in warmer days, milder nights & little chance for precipitation. Monsoon flow will remain in place over southeast AZ throughout the week & will bring the chance for afternoon thunderstorms each day. This monsoon flow regime will push back into central & western production areas by Thursday, resulting in higher humidity & improved chances for precipitation. Expect temperatures to average above normal in all production areas this week. The long range forecast for the fall (Sep-Nov) indicates a bias toward above normal temperatures & near normal precipitation. PINAL COUNTY COTTON DEVELOPMENT ADVISORY AUG 21, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | v | | 3/15**************************************************************** 3200 +3 days | | | | | | | v | | 4/1 ************************************************************* 3029 +3 days | | | | | | |v | | 4/15********************************************************* 2873 +3 days | | | | | | v | | | 5/1 **************************************************** 2621 +2 days | | | | | | v | | | 5/15************************************************ 2393 +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 20 v = Heat Units on AUG 13; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3554; Last year = 3420; Normal = 3545 HUs since Jan 1 are running about 3 days ahead of normal. HU last week = 196 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 14 - AUG 20 This Week : AUG 21 - AUG 27 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 104 76 196 64 2010 98 75 67 191 RAIN : Maricopa = 0 " Coolidge = .23 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.95" 2.12" 2.12" 2.12" 2.12" HEAT STRESS LEVELS -------------------------------- Date 8/14 8/15 8/16 8/17 8/18 8/19 8/20 Stress L1 L1 L1 L1 L1 ns ns Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- High pressure will alter the flow regime this week, bringing a return to lower humidity & much hotter temperatures. The lower humidity will greatly reduce the chances for precipitation in all production areas. Longer term forecasts suggest the moist air will return for the weekend, reducing temperatures slightly while improving the chances for precipitation statewide. Long range forecasts for the fall (September - November) indicate a bias toward above normal temperatures & near normal precipitation. Heat units can be used to estimate the maturity dates late season bolls. See publication at http://ag.arizona.edu/azmet/cotton.htm for more details. PINAL COUNTY COTTON DEVELOPMENT ADVISORY AUG 28, 2011 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | | | | v| | 3/15******************************************************************** 3399 +4 days | | | | | | | v | | 4/1 ***************************************************************** 3228 +4 days | | | | | | | v | | 4/15************************************************************* 3072 +4 days | | | | | | v| | | 5/1 ******************************************************** 2820 +3 days | | | | | | v | | | 5/15**************************************************** 2592 +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 AUG 27 v = Heat Units on AUG 20; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 3753; Last year = 3611; Normal = 3727 HUs since Jan 1 are running about 4 days ahead of normal. HU last week = 200 HISTORICAL STATISTICS -------------------------------- Last Week : AUG 21 - AUG 27 This Week : AUG 28 - SEP 3 HIGH LOW HUs DEWPT HIGH LOW DEWPT HUs Recorded 109 76 200 60 2010 102 69 62 178 RAIN : Maricopa = 0 " Coolidge = .15 " ESTIMATED WATER USE -------------------------------- Planting date : 3/15 4/1 4/15 5/1 5/15 Water Use (last week): 1.73" 1.94" 2.12" 2.14" 2.14" HEAT STRESS LEVELS -------------------------------- Date 8/21 8/22 8/23 8/24 8/25 8/26 8/27 Stress L1 L1 L1 L1 L2 L1 L1 Key : ns = no stress; L1 = Level 1 Stress; L2 = Level 2 Stress WEATHER UPDATE -------------------------------- The high pressure system responsible for the recent very hot weather will weaken this week, bringing a return to more typical monsoon weather. Expect slightly cooler temperatures by mid-week with increasing humidity in southeast & central production areas. The higher humidity will improve the chances for thunderstorms in southeast & central AZ. Dry southwest flow will develop over western AZ & keep humidity & the chances for precipitation low along the Colorado River. This will be the final cotton advisory for the 2011 growing season. Have a safe and profitable harvest season !