Dear Dr. Gijsman
Thank you very much for your mail and for your commentsl. I will appreciate very
much if you can send me a copy of your paper, now since you mentioned that the
DSSAT grass model is based in a soybean model,  the generic CROPGRO, and that
can be used for many crops e.g. tomato. I wonder if it can be used to simulate
rye grass production by modifing the genetic coeficients?.
Thank you
Octavio Castelán
Centro de Investigación en Ciencias Agropecuarias

"Gijsman, Arjan J." escribió:

> Dear Octavio,
>
> The pasture model of DSSAT was build in the structure of the soybean model
> by defining a new set of generic coefficients: the species, cultivar and
> ecotype files (*.SPE, *.CUL, *.ECO) in the DSSAT subdirectory GENOTYPE. It
> is thus not just any pasture, but the specific species Bahía grass with the
> cultivar and ecotype of unknown name as given in the G0GRO980.CUL and
> G0GRO980.ECO files. It may seem a bit funny to grow a grass in a soybean
> model, but this model is the generic CROPGRO, which can be used for many
> crops and which DSSAT also uses for tomato.
>
> A few years ago I did the same for Brachiaria decumbens, an important grass
> of improved pastures in the tropics. The results of the calibration and
> validation for this grass were presented in:
> Giraldo L.M., Lizcano L.J., Gijsman A.J., Rivera B., Franco L.H. 1998
> Adaptación del modelo DSSAT para simular la producción del Brachiaria
> decumbens. (Adapting the DSSAT model for simulating the production of
> Brachiaria decumbens). Pasturas Tropicales 20:2-12.
>
> The same work was later also presented at the Third International Symposium
> on Systems Approaches for Agricultural Development (SAAD-III) in Lima, Peru,
> from which an English-language version of the article resulted by the same
> authors. If you are interested, I have this available as PDF file.
>
> The next version of DSSAT, to be released later this year, will have both
> Bahía and Brachiaria.
>
> Arjan Gijsman
> Univ. Florida / Centro Internacional de Agricultura Tropical (CIAT)
>
> -----Original Message-----
> From: Octavio A. Castelán-Ortega [mailto:[log in to unmask]]
> Sent: Tuesday, April 09, 2002 3:13 PM
> To: [log in to unmask]
> Subject: Pasture Model
>
> Dear All
> I am just starting to use the DSSATV3.1 pasture model, so I would like
> to know what sore of data I need to calibrate the model and I would also
> appreciate very much if you can tell which papers or other relevant
> information I need to read to get familiar with it.
> Thank you very much
> Dr. Octavio Castelán
> CICA-UAEM