Dear Pradeep,
I have been out of irrigation management for some time, but managing at a
shallow level would mean more frequent irrigation and therefore a wet
surface layer more often which would increase evapotranspiration, so my gut
feel says that the model is right
Louis du Pisani
----- Original Message -----
From: "Pradeep Singh Kashyap" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, 19 April, 2001 8:55 AM
Subject: irrigation management depth


Dear members

We ran SUBSTOR-Potato model to simulate the effect of different management
depths on ET and Irrigation requirements (IR). We took irrigation management
depths as 0-30, 0-45 and 0-60 cm. The model was run for different depletion
levels using automatic irrigation (auto-refill profile). We found that total
ET and IR reduces as the depth of management increases. Similar trend was
noticed if we simulate considering various depletion levels. In my opinion
total ET and IR should increase as the depth of management increases, but
the simulations show other way round. What may be the possible reasons?

With kind regards.

Pradeep
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Pradeep Singh Kashyap
Department of Agricultural & Food Engg.
I. I. T., Kharagpur
(WB) - 721 302
India
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Tel:  091-3222-83138 (O)
                     83139 (R)
Fax: 091-3222-82244 & 55303
Alternate e-mail: [log in to unmask]
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