ROLL  COTTON DEVELOPMENT ADVISORY
                                    MAY 20, 2012 
PLANTING                                                               +/- normal
DATE+-------------------------------------------------------------------------+
    |            |   |     |      |         |           |           |         |
    |            |   |   v |      |         |           |           |         |
2/1 ************************* 1253                                        +2 days
    |            |   | v   |      |         |           |           |         |
2/15*********************** 1167                                          +1 day
    |            |   v     |      |         |           |           |         |
3/1 ********************* 1070                                            +1 day
    |            | v |     |      |         |           |           |         |
3/15******************* 953                                               +1 day
    |           v|   |     |      |         |           |           |         |
4/1 **************** 784                                                  +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 19
     v = Heat Units on MAY 12;  S,M,F = Short, Medium, and Full Season Varieties

  HEAT UNITS 
--------------------------------
Heat Unit (HU) accumulation since Jan 1 = 1437;  Last year = 1363
HUs since Jan 1 are running about 2 days ahead of normal.
HU last week = 146

HISTORICAL STATISTICS 
--------------------------------
  Last Week : MAY 13 - MAY 19             This Week : MAY 20 - MAY 26
           HIGH  LOW DEWPT HUs  RAIN               HIGH  LOW DEWPT HUs
  Normal     98   59   41  143  ----       Normal    97   59   44  141
  Recorded  103   58   46  146  0.00         2011    95   57   40  132

ESTIMATED WATER USE 
--------------------------------
      Planting date :     2/1    2/15      3/1    3/15     4/1
Water Use (last week):    1.14"   1.02"     .88"    .72"    .49"

WEATHER UPDATE 
--------------------------------
--High pressure will dominate AZ weather early this week, producing near record
heat on Monday & Tuesday. A series of storm systems are forecast to move across
the Great Basin later in the week, resulting in windy & cooler (near normal)
conditions. No precipitation is expected with these storm systems.
-- Growers should closely monitor soil moisture & avoid crop water stress. First
post-plant irrigations (PPI) are typically applied at 800-1000 HUs after planting
with earlier PPIs in coarse textured soils & later PPIs in finer textured soils.
High rates of evaporative demand (ED) can also result in earlier PPIs. Last week's
hot & dry weather produced high rates of ED. High ED is expected again this week.
More details on PPIs are available at www.cals.arizona.edu/pubs/crops/az1204.pdf.