Heidi,

You might want to check the simulation control options in your file.
Please make sure that NITRO and SYMBI are set to "Y." However, please
note that if you set the rhizobia number and effectiveness to 0, dry
bean will start acting like a corn plant, and extract nitrogen from
the soil. Without nitrogen your crop will not be able to grow.

One question I have relates to your field data. How accurate are your
LAI data and how did you or your collaborators measure it? If your
biomass predictions, e.g., total biomass and leaf and stem mass, fit
well, there is a high likelihood that there is a problem with your
LAI measurements.

Regards,

Gerrit

At 02:24 PM 09/17/2006, you wrote:
>Hello:
>
>I am trying to add a cultivar of common bean from Uzbekistan to the
>BNGRO040.CUL file following the methodology outlined by Ken Boote.  I
>am at the stage of trying to fit the simulated LAI to our field
>measured data, and cannot force the LAI low enough without decreasing
>SLAVR much lower than any other cultivars.  As we observed little or no
>nodule formation in the field with our beans, we have set the rhizobia
>number and effectiveness to 0 in X_Build.  However, this does not
>produce any effect on LAI, biomass, yield or the nitrogen stress factor.
>
>Does anyone have any advice?
>
>Thank you,
>
>Heidi