MARANA  COTTON DEVELOPMENT ADVISORY
                                    AUG 31, 2008 
PLANTING                                                               +/- normal
DATE+-------------------------------------------------------------------------+
    |            |   |     |      |         |           |           |         |
    |            |   |     |      |         |           |           | v 3542  |
3/15***********************************************************************  +5 days
    |            |   |     |      |         |           |          v|         |
4/1 ******************************************************************* 3364 +5 days
    |            |   |     |      |         |           |      v    |         |
4/15**************************************************************** 3191   +4 days
    |            |   |     |      |         |           | v         |         |
5/1 *********************************************************** 2951      +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 30
     v = Heat Units on AUG 23;  S,M,F = Short, Medium, and Full Season Varieties


  HEAT UNITS 
--------------------------------
Heat Unit (HU) accumulation since Jan 1 = 3891;  Last year = 4171;  Normal = 3779
HUs since Jan 1 are running about 5 days ahead of normal.
HU last week = 184


HISTORICAL STATISTICS 
--------------------------------
  Last Week : AUG 24 - AUG 30             This Week : AUG 31 - SEP 6
           HIGH  LOW DEWPT HUs  RAIN               HIGH  LOW DEWPT HUs
  Normal     97   71   62  176  ----       Normal    97   68   59  171
  Recorded   96   73   63  184  0.27         2007    99   72   58  183


ESTIMATED WATER USE 
--------------------------------
      Planting date :    3/15     4/1     4/15     5/1
Water Use (last week):    1.33"   1.51"    1.69"   1.84"


HEAT STRESS LEVELS 
--------------------------------
Date     8/24   8/25   8/26   8/27   8/28   8/29   8/30  
Stress    L1     ns     ns     ns     ns     ns     ns  
Key :  ns = no stress;  L1 = Level 1 Stress;  L2 = Level 2 Stress 


WEATHER UPDATE 
--------------------------------
A weak storm system & trough of low pressure may produce a significant rain
event Sunday & Monday. Warm & dry air will follow this system & could signal
the end of the monsoon season. Expect sunny & warm conditions from Tuesday on
with much lower humidity. Boll maturity estimates can assist growers with de-
cisions pertaining to late season irrigations & crop termination and are avail-
able at at http://ag.arizona.edu/azmet/Boll_Maturity_2006.pdf. This will be the
final advisory for the 2008 season. We would like to thank the Arizona Cotton
Research & Protection Council for their funding assistance which helps keep this
program functional. Your feedback regarding the future of this program would be
most appreciated. Please email Paul Brown at pbrown@ag.arizona.edu.