ROLL MAR 15, 2015 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | v | **************************** | ************ 555 *********** | **************************** | | ^ 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 HEAT UNITS -------------------------------- HUs are running about 10 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 81 43 34 71 ---- Normal 82 45 34 76 Recorded 86 47 45 93 0.00 2014 82 39 34 73 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 66 MAR 14 ; Min = 60.1 MAR 8 WEATHER UPDATE -------------------------------- --Some shower activity is possible this week as a pair of low pressure systems pass through the area. The first system will pass south of AZ on Monday & Tues- day, resulting in a chance for showers in eastern AZ. A 2nd system will move through the area mid-week, providing a chance for showers Wednesday & Thursday across southern & central AZ. Very warm temperatures Monday will be followed by a slight cooling trend mid-week with a return to warm & dry conditions for the weekend. Temperatures will average above normal this week. --Acceptable germination results when minimum soil temperatures(8am) exceed 60F. Soils approach 60F at 8am when minimum air temperatures(sunrise) remain above 47F. ROLL MAR 29, 2015 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | v | ************************************** | ***************** 751 **************** | ************************************** | | ^ 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 HEAT UNITS -------------------------------- HUs are running about 14 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 83 46 35 80 ---- Normal 81 47 35 76 Recorded 90 48 40 103 0.00 2014 77 43 40 59 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 69.1 MAR 28 ; Min = 67.3 MAR 24 WEATHER UPDATE -------------------------------- High pressure will dominate AZ weather this week, resulting in sunny & dry conditions with above normal temperatures. Breezy to windy conditions may develop late in the week as a storm system moves north of the state. Long range forecasts issued by the Climate Prediction Center indicate a bias for above normal precipitation for April through September. Temperature forecasts for the same period suggest near normal temperatures for eastern AZ grading to above normal in western AZ. Heat unit based planting windows(see graph) are open for all locations below 4000' Growers in central/western AZ should complete their plantings of full season varieties as soon as practicable to minimize problems with mid-summer heat stress. ROLL APR 5, 2015 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | v | ******************************************* | ******************** 857 ****************** | ******************************************* | | ^ normal | | PLANTING WINDOWS | | | Short Season ---------------| | | | Medium Season ----| | | | Full Season | | +---------+---------+---------+---------+---------+---------+---------+---+ 0 200 400 600 800 1000 1200 1400 HEAT UNITS (HU) ACCUMULATED FROM JAN 1 - APR 4 v = Heat Units accumulated from JAN 1 - MAR 28 HEAT UNITS -------------------------------- HUs are running about 15 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 81 47 35 76 ---- Normal 83 47 34 81 Recorded 91 49 41 107 0.00 2014 93 46 36 106 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 72.1 APR 1 ; Min = 69.1 APR 3 WEATHER UPDATE -------------------------------- --Two storm systems are forecast to impact AZ this week. The first system will move across the Great Basin mid-week, resulting cooler & windy conditions. High pressure will redevelop late in the week, producing a brief warming trend prior to the arrival of the 2nd system this weekend. The 2nd system will move across northern Mexico & may produce some precipitation by Sunday. --Heat unit based planting windows (see graph) are open for all locations due to the warm March weather. A good planting forecast should call for clear & dry weather with highs above 80F & lows of 48F & above. Growers planning to plant this week should monitor the development of the storm systems described above. ROLL APR 12, 2015 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | v | *********************************************** | ********************** 932 ******************** | *********************************************** | | ^ 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 HEAT UNITS -------------------------------- HUs are running about 13 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 83 47 34 81 ---- Normal 86 48 34 91 Recorded 82 44 37 76 0.00 2014 90 48 40 102 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 70 APR 5 ; Min = 67.5 APR 9 WEATHER UPDATE -------------------------------- --A strong storm system is expected to drop into the into the 4-Corners region by mid-week, producing very windy conditions & much cooler temperatures. No precipitation is expected with this system & current forecasts indicate the coldest days will be Thursday & Friday. This cool spell with be short-lived with a return to normal temperatures by the weekend. --Heat unit based planting windows (see graph) are open for all locations. A good planting forecast calls for clear & dry weather with highs above 80F & lows of 48F & above. Growers planning to plant this week should monitor the development of the mid-week storm system. ROLL APR 19, 2015 COTTON PLANTING DATE ADVISORY +-------------------------------------------------------------------------+ | v | *************************************************** | *********************** 1020 ********************** | *************************************************** | | ^ 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 HEAT UNITS -------------------------------- HUs are running about 12 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 86 48 34 91 ---- Normal 87 50 37 99 Recorded 85 47 38 89 0.00 2014 90 52 47 104 SOIL TEMPERATURES -------------------------------- Last Week's 8am Soil Temp: Max = 72.3 APR 15 ; Min = 68.7 APR 17 WEATHER UPDATE -------------------------------- --Expect sunny & warm conditions through mid-week. Another storm system is expected to impact AZ by Wednesday with strong winds, followed by a chance for showers Thursday. Cooler temperatures are expected Thursday & Friday, followed by much warmer temperatures for the weekend. Locations most favored for precipitation with this system are central & northern AZ. --Heat unit based planting windows (see graph) are open for all locations. --Plant population (PP) should range from 25,000-50,000 plants/a. To assess, count the number of plants in 1/1000 a & multiply by 1000. Row length equal to 1/1000 a: 40" row = 13'1", 38" row = 13'9", 36" row = 14'6", 30" row = 17'5". ROLL COTTON DEVELOPMENT ADVISORY APR 26, 2015 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | v| | | | | | | 2/1 ******************* 951 +11 days | v | | | | | | | 2/15**************** 809 +7 days | v | | | | | | | | 3/1 ************** 686 +5 days | v | | | | | | | | 3/15*********** 544 +3 days | v | | | | | | | | 4/1 ****** 296 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 APR 25 v = Heat Units on APR 18; S,M,F = Short, Medium, and Full Season Varieties HEAT UNITS -------------------------------- Heat Unit (HU) accumulation since Jan 1 = 1111; Last year = 1101 HUs since Jan 1 are running about 10 days ahead of normal. HU last week = 92 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 50 37 99 ---- Normal 91 52 36 111 Recorded 85 49 44 92 0.00 2014 91 52 38 112 ESTIMATED WATER USE -------------------------------- Planting date : 2/1 2/15 3/1 3/15 4/1 Water Use (last week): .59" .44" .34" .34" .34" WEATHER UPDATE -------------------------------- --High pressure will develop over AZ this week, resulting in clear & dry condi- tions with light winds & warm temperatures. Temperatures will increase to above normal levels by Tuesday & continue for the remainder of the week. Long range forecasts indicate the development of another storm system by early next week. --Plant population (PP) should range from 25,000-50,000 plants/a. To assess, count the number of plants in 1/1000a & multiply by 1000. Row length equal to 1/1000a: 40" row = 13'1", 38" row = 13'9", 36" row = 14'6", 30" row = 17'5". --Crops in western production areas should be approaching pinhead square, the transition from vegetative to reproductive growth, that occurs at ~700 HUAP. ROLL COTTON DEVELOPMENT ADVISORY MAY 3, 2015 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | |v | | | | | | 2/1 ********************* 1070 +11 days | | v | | | | | | | 2/15******************* 928 +7 days | v | | | | | | | 3/1 **************** 805 +5 days | v | | | | | | | | 3/15************* 663 +4 days | v | | | | | | | | 4/1 ******** 415 0 days | | | | | | | | | | Pin Sus 1st 1" Pk. Bloom Cut-Out Terminate | | head Sq. Flowr Boll +---+---+ +---+---+ +---+---+ | | S M F S M F S M F | +-------+-------+-------+-------+-------+-------+-------+-------+-------+-+ 0 400 800 1200 1600 2000 2400 2800 3200 3600 HEAT UNITS ACCUMULATED FROM PLANTING to MAY 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 = 1230; Last year = 1213 HUs since Jan 1 are running about 10 days ahead of normal. HU last week = 120 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 52 36 111 ---- Normal 93 55 39 123 Recorded 94 53 44 120 0.00 2014 90 50 36 101 ESTIMATED WATER USE -------------------------------- Planting date : 2/1 2/15 3/1 3/15 4/1 Water Use (last week): .84" .66" .5" .4" .4" WEATHER UPDATE -------------------------------- --Two storm systems will impact AZ this week. The 1st system will pass through the state Monday, bringing cooler temperatures & a chance for scattered thunder- storms. The 2nd system will drop into the Great Basin on Wednesday, resulting in windy conditions & a continuation of cool temperatures. No precipitation is ex- pected with the 2nd system. Temperatures should average ~3 degrees below normal. --Crops in western production areas should be approaching pinhead square (PHS), the transition from vegetative to reproductive growth that occurs at ~700 HUAP. The optimal time for N fertilizer applications is between PHS & peak bloom. See http://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1243.pdf ROLL COTTON DEVELOPMENT ADVISORY MAY 17, 2015 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | v| | | | | | 2/1 ************************* 1261 +6 days | | | v | | | | | | 2/15********************** 1119 +3 days | | v | | | | | | 3/1 ******************** 996 +1 day | |v | | | | | | | 3/15***************** 854 0 days | v | | | | | | | | 4/1 ************ 606 -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 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 = 1421; Last year = 1436 HUs since Jan 1 are running about 5 days ahead of normal. HU last week = 95 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 10 - MAY 16 This Week : MAY 17 - MAY 23 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 95 56 39 130 ---- Normal 96 59 43 139 Recorded 84 53 47 95 0.32 2014 93 54 36 119 ESTIMATED WATER USE -------------------------------- Planting date : 2/1 2/15 3/1 3/15 4/1 Water Use (last week): .9" .75" .62" .47" .33" WEATHER UPDATE -------------------------------- --Several late spring storms are expected to move across the Great Basin this week, resulting in another week of variable weather. Generally warm weather on Monday will be followed by a brief cool spell Tuesday followed by a 2nd period of warming mid-week. A 3rd storm system will pass north of the area late in the week, generating another period of below normal temperatures for the weekend. Little or no precipitation is expected with this unsettled weather, but periods of breezy/windy conditions are expected as these systems move north of the area. Temperatures should average 3-5 degrees below normal for the week. Longer term forecasts indicate the current cool pattern may last until Memorial Day weekend. ROLL COTTON DEVELOPMENT ADVISORY MAY 24, 2015 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | |v | | | | | 2/1 *************************** 1363 +4 days | | | v | | | | | | 2/15************************ 1221 +1 day | | | v | | | | | | 3/1 ********************** 1098 -1 day | | v| | | | | | | 3/15******************* 956 -2 days | v | | | | | | | | 4/1 ************** 708 -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 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 = 1523; Last year = 1555 HUs since Jan 1 are running about 4 days ahead of normal. HU last week = 102 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 17 - MAY 23 This Week : MAY 24 - MAY 30 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 96 59 43 139 ---- Normal 98 59 43 142 Recorded 85 54 46 102 0.00 2014 104 63 44 162 ESTIMATED WATER USE -------------------------------- Planting date : 2/1 2/15 3/1 3/15 4/1 Water Use (last week): 1.14" .97" .82" .65" .37" WEATHER UPDATE -------------------------------- --Six weeks of below normal temperatures will end this week with the exit of a weak storm system on Monday. High pressure will then develop over AZ, resulting in mostly clear skies, low humidity & much warmer temperatures. Temperatures should reach above normal levels by the weekend. Some precipitation associated with the departing storm system may develop in high elevation areas Monday. Dry conditions are expected statewide after Monday. --The cool, wet May has improved water supply forecasts for the Colorado River. The Colorado Basin River Forecast Center now projects April to July flow at ~5 million acre feet (AF), an increase of ~2 million AF over the 1 May forecast. ROLL COTTON DEVELOPMENT ADVISORY MAY 31, 2015 PLANTING +/- normal DATE+-------------------------------------------------------------------------+ | | | | | | | | | | | | | v | | | | | 2/1 ****************************** 1487 +3 days | | | v | | | | | 2/15*************************** 1345 0 days | | | v | | | | | | 3/1 ************************ 1222 -2 days | | |v | | | | | | 3/15********************** 1080 -3 days | v | | | | | | | 4/1 ***************** 832 -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 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 = 1647; Last year = 1717 HUs since Jan 1 are running about 3 days ahead of normal. HU last week = 125 HISTORICAL STATISTICS -------------------------------- Last Week : MAY 24 - MAY 30 This Week : MAY 31 - JUN 6 HIGH LOW DEWPT HUs RAIN HIGH LOW DEWPT HUs Normal 98 59 43 142 ---- Normal 101 61 42 150 Recorded 96 54 45 125 0.00 2014 106 61 40 156 ESTIMATED WATER USE -------------------------------- Planting date : 2/1 2/15 3/1 3/15 4/1 Water Use (last week): 1.39" 1.21" 1.05" .86" .54" WEATHER UPDATE -------------------------------- --Strong high pressure will produce hot & dry conditions through mid-week. The only exception may be eastern AZ where there is a slight chance for high eleva- tion showers Monday. High pressure will weaken late in the week as a trough of low pressure approaches from the west. Slightly cooler conditions are expected with this system & longer term forecasts suggest a slight chance for showers as this trough impacts the region. --Nitrogen (N) should be applied between pinhead square & peak bloom. Split ap- plications are recommended to improve N use efficiency. See publication at http://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1243.pdf