Dear listserv members,

I understand this forum mainly pertains to the DSSAT simulation software
and so this question may be a little off topic.  But I figured the
members would likely be very knowledgeable.

Can some one point me toward the latest evidence on the likely effects
of CO2 fertilization on corn, soybean, and cotton yields?  I have found
a few papers suggesting fairly large positive effects, and most of these
employ simulation models.  I have also seen papers suggesting that while
yields may increase, caloric content increases much less.  I'm
interested in the most compelling evidence and how this is folded into
the simulation models.  No need to spell out the details, but citations
would be greatly appreciated.

Many thanks,

Michael J. Roberts
USDA Economic Research Service
Washington, DC 20036
202-694-5557