Albert,
There has also been a lot of work completed on CERES-Maize and a similar model
(APSIM), particularly in deriving coefficients for maize varieties in southern
Africa. For CERES specifically, best contact is probably Andre DuToit in RSA,
and I think he is on this listserver (Andre??). Also, Phil Thornton did a lot of
work in Malawi. CIMMYT also may be able to help, let me know if you need to
contact any of these people.
Peter
Albert Calitz wrote:
> Hello Richard
>
> Beautiful, you are like water in a desert.
>
> Thanks a lot!
>
> -----Original Message-----
> From: DSSAT - Crop Models and Applications [mailto:[log in to unmask]]On
> Behalf Of Richard Ogoshi
> Sent: Wednesday, November 07, 2001 5:00 AM
> To: [log in to unmask]
> Subject: Re: Data collection sheets
>
> Hello Albert,
> Aloha!
> I don't have any data collection sheets, but for the kind of data you
> will need to calibrate the models you may want to revisit the manuals. In
> DSSAT version 3 volume 4, pages 179 to 199, Dr. Boote discusses some
> concepts in calibrating the model to measured crop data. On pages 201 to
> 207, Dr. Boote discusses what data to collect. On pages 209 to 213, Dr.
> Boote discusses how to collect the data. On pages 215 to 286, there are
> detailed instructions on how to collect the crop data.
> All crop data recorded from samplings before the final harvest are put
> into file T. In file T, the data are placed under appropriate headers that
> may include:
> CWAD = tops weight (kg dry matter / ha)
> GWAD = grain weight (kg dry matter / ha)
> LAID = leaf area index
> LWAD = leaf weight (kg dry matter / ha)
> SLAD = specific leaf area (cm2 / g)
> SWAD = stem weight (kg dry matter / ha)
> Dr. Boote discusses three levels of model evaluation that vary in the
> amount of data that is collected (see DSSAT version 3 volume 4, pages 205
> to 206). You will need to decide which is the appropriate amount of data
> for your needs. Please see DSSAT version 3 volume 2, page 88, for more
> headers and data that can be included in file T.
> A data sheet that can help you collect the data may look like this:
>
> Date CWAD GWAD LAID SLAD SWAD
> xxxx aa.aa bb.bb cc.cc dd.dd ee.ee
> xxxx aa.aa bb.bb cc.cc dd.dd ee.ee
> xxxx aa.aa bb.bb cc.cc dd.dd ee.ee
> xxxx aa.aa bb.bb cc.cc dd.dd ee.ee
>
> Other data needed for calibration include soil (see screen 27 in DSSAT
> version 3 volume 1 page 63), weather (DSSAT version 3 volume 2, pages 41 to
> 43), management (DSSAT version 3 volume 1, pages 129 to 138; DSSAT version
> 3 volume 2, pages 116 to 119) and initial conditions (DSSAT version 3,
> volume 1, pages134 to 136).
> I hope this helps.
> Sincerely,
> Richard
>
> At 04:53 AM 11/6/01 -1000, you wrote:
> >Hallo Everyone
> >
> >I need to calibrate the DSSAT model for Namibian conditions. I am looking
> >for examples of data collection sheets, or something similar, specifying
> the
> >primary data and unit of measurement, needed to do the calibration. I just
> >cannot find sufficient details in the manuals.
> >
> >Currently we are focusing on Maize, Millet and Sorghum.
> >
> >The following are also important; Chickpea, Drybean, Pasture, Peanut,
> >Potato, Rice, Soybean, Sunflower, Tomato and Wheat.
> >
> >Any advice and or info are on this stage very welcome!
> >
> >Thank you,
> >
> >Albert Calitz
> >Agro-ecological zoning programme
> >Namibia
> >
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