Abdolali --
 
At 04:17 PM 7/14/98 GMT0BST, you wrote:
>Dear all
>I wish to detemine the effects of a +/- 10% rainfall on yield of the
>wheat. I would really appreciate If someone tell me how I can do this
>in the environmental section (climate change study) of DSSATv.3.
 
Assuming that you want +/- 10% rain for each rain event the following
should probably work.  If you want +/- 10% number of rain events I think
you will need to change the weather files.
 
The only difference between the two treatments is the pointer in the
*TREATMENT section and the actual lines in the *ENVIROMENTAL MOD section.
 
*TREATMENTS                        -------------FACTOR LEVELS------------
@N R O C TNAME.................... CU FL SA IC MP MI MF MR MC MT ME MH SM
 1 1 0 0 -10% rainfall              1  1  0  1  0  0  0  0  0  0  1  1  1
 1 1 0 0 +10% rainfall              1  1  0  1  0  0  0  0  0  0  2  1  1
 
*ENVIRONMENTAL MODIFICATIONS
@E ODATE  EDAY  ERAD  EMAX  EMIN ERAIN  ECO2  EDEW EWIND
 1 97001 A 0.0 A 0.0 A 0.0 A 0.0 M 0.9 A 0.0 A 0.0 A 0.0
 2 97001 A 0.0 A 0.0 A 0.0 A 0.0 M 1.1 A 0.0 A 0.0 A 0.0
 
==============================================================
Brian Baer                              [log in to unmask]
Program Analyst
Dept. of Crop & Soil Science            (517) 353-8537 (voice)
A574 Plant and Soil Science Building
Michigan State University               (517) 353-8538 (fax)
East Lansing, Michigan  48824-1325
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