Hello Everybody --
I've been working with an Ag-Economist on some Maize-Soybean rotations under
DSSAT 3.0. We are getting more N leaching than we were told was "normal"
for this region and looking at the NITROGEN.OUT file we find N fixation for
different years of soybean of between 150-350 Kg N/ha (and in one case 518
Kg N/ha) with the average an average of around 225 Kg N/ha. I looked in a
basic crop production book and it seems to indicate that 200 Kg N/ha is the
maximum one would expect with Soybeans. So guess we are wondering: are the
predictions we are getting too large? If so have other people noticed this
problem? Is there a way to get CROPGRO to predict lower values?
Thanks for your help.
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Brian Baer [log in to unmask]
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Program Analyst | Acting Center Coordinator
Dept. of Crop & Soil Science | The Listening Ear
A574 Plant and Soil Science Building | Crisis Intervention Center
Michigan State University | 423 Albert Street
East Lansing, Michigan 48824-1325 | East Lansing, Michigan 48823
(517) 353-8537 | (517) 337-1717
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