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Subject:
Re: ET
From:
"Sommer, Rolf (ICARDA)" <[log in to unmask]>
Reply To:
Sommer, Rolf (ICARDA)
Date:
Thu, 20 Jan 2011 09:48:10 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (45 lines) 
Dear Fidel,

I guess you are talking about 400 mm/yr potential Priestley-Taylor (PT) ET, right?

If you think this is too low, most likely there is something wrong with your radiation (correct units?) or temperature data.

The best would probably be to calculate PT-ET yourself, and compare the results with what DSSAT produces.
(I am sure the error lies on the input side...)


By the way, the PT method is not consider very precise - some even call it the Priestley-Failure method.

Regards,
Rolf




> -----Original Message-----
> From: DSSAT - Crop Models and Applications [mailto:[log in to unmask]]
> On Behalf Of Fidel Peņa Ramos
> Sent: Wednesday, January 19, 2011 23:00
> To: [log in to unmask]
> Subject: ET
>
> I'm running DSSAT v 4.0.2 in three regions of Coahuila Mexico for growing
> corn
> Radiation is ok
> Temperature is ok
> The potential evapotranspiration is estimated with the method of Prisley-
> T. ET values are very low (<400) for the cultivation of high yield in the
> three regions
>
> Why is this happening?
> What should I consider?
>
> _____________________
> Fidel Maximiano Peņa Ramos
> e-mail: [log in to unmask]
>            [log in to unmask]
>
>
>
>

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