To all:

I would say the impact of crop residues/tillage on microclimate in
general - the tillage / residues scenario influences all aspects of the
crop and soil microclimate beginning with effects on net radiation and
therefore soil temperature, canopy temperature, evapotranspiration, etc.

-Deborah Abrahamson (Stark)

----- Original Message -----
From: "ken boote" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, March 03, 2003 11:23 AM
Subject: Re: Special session on modeling tillage at ASA meetings in
Denver, Nov. 2003


> Jeff:
>
> Good session, but I see a big gap.  There needs to be discussion about
> modeling the impact of crop residues/tillage on soil temperature.  I
don't
> think the residue/tillage effect on evaporation is enough to highlight
this
> effect, especially if done in a rather simplistic way.  In my opinion,
> possibly up to half of the effect of the no-tillage/residue effect on
crop
> production in northern USA is the cooler soil temperature experienced.
We
> will not get it right until soil temperature is also addressed.  Who
will
> work on that?
>
> Ken Boote
>
> At 11:34 AM 2/28/03 -0700, you wrote:
> >Colleagues,
> >
> >Please see the notice below for information on a special session to
look
> >at strategies for modeling effects of tillage and no-till.
> >
> >Best regards,
> >Jeff
> >
> >
> >
> >Special Session on Modeling Tillage at the 2003 Meetings of the
> >ASA-CSSA-SSSA, November 2003, Denver, Colorado
> >
> >Few simulation models attempt to model effects of tillage and residue
> >management with sufficient detail to represent expected differences
> >between conventional tillage and no-till systems. During the business
> >meeting of Division A-3 of the American Society of Agronomy in 2002,
the
> >suggestion was made to hold a special session of A-3 to look at
approaches
> >
> >for modeling tillage. The overall objective would be to assess
current
> >approaches to modeling tillage and suggest possible research
activities
> >over the next few years. Possible topics to cover in the session
would
> >include:
> >- Agronomists' perspective of modeling needs for conservation
agriculture:
> >
> >high input systems
> >- Agronomists' perspective of modeling needs for conservation
agriculture:
> >
> >low input systems
> >- Modeling soil water balances when mulch layers are present
> >- Modeling residue incorporation and decomposition
> >- Modeling soil biological activity
> >- Modeling tillage effects on soil physical properties
> >- Modeling carbon sequestration
> >- Documenting tillage and residue management practices for model
inputs
> >and validation
> >         Individual talks would be 20 minutes long and depending on
> >interest, we would have a half or whole day session. At the end of
the
> >session, a brief summary would be given, followed by an open
discussion on
> >research needs and approaches.
> >         If you are interested in presenting papers during this
session,
> >please contact:
> >Rolf Sommer, CIMMYT, [log in to unmask] (Tel. 52-55-5804-2004 Ext.
2128)
> >Jeff White, US Water Conservation Lab, [log in to unmask]
> >            (tel 602-437-1702, ext 268)
> >
> >Please note that participants should submit title summary forms
through
> >the ASA web site by 27 March. We regret that no funds are available
to for
> >travel costs or registration fees.
>