Dear Romulo,

DSSAT rules, at least when you ask at the DSSAT listserver! ;-)

But seriously:
First of all, you have to explain a little bit more, what the hypotheses are
in these field experiments. I would say that a model rarely gives you
answers so that you can formulated the associate questions.

From what you write, I guess that opportunities for modeling are quite
limited in your case.
Chemical properties: only N is currently modeled. pH, P, K and so one not.
Physical properties: e.g. bulk density or water retention characteristics
are not influenced by management practices in DSSAT (maybe EPIC is doing a
better job).
Biological properties: what do you mean, micro-fauna or mycorrhyza? (Both
not modeled by DSSAT)

Regards,
Rolf
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Rolf Sommer
Natural Resources Program
CIMMYT (International Maize and Wheat Improvement Center)
Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico
Tel. +52 (55) 5804 2004  Ext. 2128
Fax +52 (55) 5804 7558/59
www.cimmyt.org
CIMMYT is a Future Harvest Center of the CGIAR
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> -----Original Message-----
> From: Romulo P. Scorza Jr. [mailto:[log in to unmask]]
> Sent: Friday, February 28, 2003 12:05
> To: [log in to unmask]
> Subject: Information
>
>
> Dear all,
>
> I got some data from a field experiment in which they tested
> the influence of different tillage practices on the physical,
> chemical and biological soil properties and also on the
> productivity of some crops.
> One idea came to my mind: to use a simulation model that uses
> as input data those physical, chemical and biological
> properties and therefore conclude after some simulations the
> implications of these different tillage practices. However, I
> have some problems:
>
> 1) Which simulation models are more suitable for this situation?
>
> 2) Which processes that I should consider (simulate) to have
> these soil properties as important parameters?
>
> 3) Will these simulation models (or the process I am looking
> at) be sensitive to the physical, chemical and biological
> properties?
>
> Sorry for this quite broad question but I hope some of you
> can help me.
>
> Kind regards,
>
> Rômulo
>
> *************************************************
> ROMULO PENNA SCORZA Jr., Ph.D.
> Embrapa - CPAO
> BR 163  KM 253,6 - Caixa Postal 661
> CEP 79804-970 - Dourados - MS - BRAZIL
> Phone: + 55 (67) 425-5122
> Fax: + 55 (67) 425-0811
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>