YUMA VALLEY  COTTON DEVELOPMENT ADVISORY
                                    MAY 12, 2013 
PLANTING                                                               +/- normal
DATE+-------------------------------------------------------------------------+
    |            |   |     |      |         |           |           |         |
    |            |   |    v|      |         |           |           |         |
2/1 ************************* 1252                                        +6 days
    |            |   |  v  |      |         |           |           |         |
2/15*********************** 1162                                          +6 days
    |            |   |v    |      |         |           |           |         |
3/1 ********************** 1082                                           +7 days
    |            | v |     |      |         |           |           |         |
3/15******************* 926                                               +6 days
    |         v  |   |     |      |         |           |           |         |
4/1 ************* 663                                                     +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 11
     v = Heat Units on MAY 4;  S,M,F = Short, Medium, and Full Season Varieties

  HEAT UNITS 
--------------------------------
Heat Unit (HU) accumulation since Jan 1 = 1383;  Last year = 1166;  Normal = 1296
HUs since Jan 1 are running about 4 days ahead of normal.
HU last week = 121

HISTORICAL STATISTICS 
--------------------------------
  Last Week : MAY 5 - MAY 11              This Week : MAY 12 - MAY 18
           HIGH  LOW DEWPT HUs  RAIN               HIGH  LOW DEWPT HUs
  Normal     92   58   42  129  ----       Normal    94   60   44  140
  Recorded   87   59   46  121  0.00         2012    88   54   43  107

ESTIMATED WATER USE 
--------------------------------
      Planting date :     2/1    2/15      3/1    3/15     4/1
Water Use (last week):    1.14"   1.02"     .91"    .69"    .43"

WEATHER UPDATE 
--------------------------------
--The low pressure system responsible for the recent stretch of windy weather is
expected to move out of Mexico Tuesday, opening the door for a return to hot &
dry weather. There is a slight chance for thunderstorms in eastern AZ on Tuesday
as this system moves out. Expect sunny & dry conditions late this week with temp-
eratures exceeding 100F in lower desert areas. A slight cooling trend is expected
this weekend as another dry storm system passes north of AZ.

--The transition from vegetative growth to early reproductive development occurs
with the formation of the first fruiting branches at nodes 5-7. This transition,
known as pinhead square (PHS), usually occurs at ~700 HUs after planting (HUAP).  
N fertilizer should be applied in split applications between PHS & early bloom
which occurs at ~1200 HUAP (see publication AZ1200 on ACIS website for details).