Hello Muhammad,
   In case you did not receive a response to your question, you can find an
explanation of CO2 effects on simulated wheat growth in:
Rosenzweig, C. and A. Iglesias. 1998. The use of crop models for international
climate change impact assessment. p. 267-292. In G.Y. Tsuji, G. Hoogenboom,
and
P.K. Thornton (eds.) Understanding options for agricultural production. Kluwer
Academic Publishers, Dordrecht, The Netherlands.
   You will be especially interested in pages 275-276. I hope this helps.
Sincerely,
Richard


At 11:42 PM 7/26/02 +0500, muhammad asim wrote:
>
> Dear list members,
>
> I'm using validated DSSAT 3.5 to simulate the impact of change in
> concentration of atmospheric CO2 (with predicted CO2 concentration) on Wheat
> yield in Pakistan for the year 2020. I want to know in detail how the model
> accounts for CO2 effect on Wheat growth and development, crop duration and
> particularly yield. Any help would be greatly appreciated.
> Regards
> Muhammad Asim
> Wheat Programme
> National Agricultural Research Centre
> Islamabad, Pakistan
>
>
>
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