YUMA VALLEY  COTTON DEVELOPMENT ADVISORY
                                    AUG 24, 2008 
PLANTING                                                               +/- normal
DATE+-------------------------------------------------------------------------+
    |            |   |     |      |         |           |           |         |
    |            |   |     |      |         |           |           |   3842v |
2/1 **************************************************************************-1 day
    |            |   |     |      |         |           |           | 3765v   |
2/15**************************************************************************-1 day
    |            |   |     |      |         |           |           |   v 3640|
3/1 ************************************************************************* -1 day
    |            |   |     |      |         |           |           |v  3509  |
3/15**********************************************************************  -1 day
    |            |   |     |      |         |           |        v  |         |
4/1 ****************************************************************** 3309 -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 AUG 23
     v = Heat Units on AUG 16;  S,M,F = Short, Medium, and Full Season Varieties


  HEAT UNITS 
--------------------------------
Heat Unit (HU) accumulation since Jan 1 = 3941;  Last year = 4100;  Normal = 4032
HUs since Jan 1 are running about 3 days behind normal.
HU last week = 202


HISTORICAL STATISTICS 
--------------------------------
  Last Week : AUG 17 - AUG 23             This Week : AUG 24 - AUG 30
           HIGH  LOW DEWPT HUs  RAIN               HIGH  LOW DEWPT HUs
  Normal    105   78   61  203  ----       Normal   105   77   63  200
  Recorded  107   77   59  202  0.00         2007   111   82   64  212


ESTIMATED WATER USE 
--------------------------------
      Planting date :     2/1    2/15      3/1    3/15     4/1
Water Use (last week):     1.4"   1.51"    1.69"   1.87"   2.15"


HEAT STRESS LEVELS 
--------------------------------
Date     8/17   8/18   8/19   8/20   8/21   8/22   8/23  
Stress    L1     L1     L1     ns     ns     L1     L1  
Key :  ns = no stress;  L1 = Level 1 Stress;  L2 = Level 2 Stress 


WEATHER UPDATE 
--------------------------------
An increase in humidity & thunderstorm activity is expected through mid-week as
the remnants of tropical storm Julio impact AZ. Expect near normal temperatures,
high humidity & scattered thunderstorms Monday & Tuesday.  High pressure will
redevelop over the region by mid-week, bringing a return to warmer and drier
conditions for the remainder of the week. Another surge of humidity is possible
by the weekend.
    
Boll maturity estimates can assist growers with decisions pertaining to late
season irrigations and crop termination. These estimates are available at
http://ag.arizona.edu/azmet/Boll_Maturity_2006.pdf