Dear Colleagues,
Kindest regards,
It is great to see after a long time some discussion on soil temperature and
its effect on evaporation together with tillage operations as wel as
residues.I have some reliable instrumentation in India that measures these
things precisely.Can any one of you who are interested try to tell me what
exactly the data they wanted, so that i can transmit that i have as of now,
and collect at field level and arrange the same if some (1 month or so) time
is given.
Dr.V.Radha Krishna Murthy,M.Sc(Ag),PGDES,Ph.D,
Associate Professor,
Department of Agronomy,
College of Agriculture,
ANGR Agricultural University,
Rajendranagar,
Hyderabad.A.P.India,500030.







>From: Deborah Stark <[log in to unmask]>
>Reply-To: DSSAT - Crop Models and Applications <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: Special session on modeling tillage at ASA meetings in
>      Denver, Nov. 2003
>Date: Mon, 3 Mar 2003 11:52:56 -0500
>
>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.
> >


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