Hi,
Those who wish to have a copy of " MCMASTER, G.S. & W.W. WILHELM (1997)Growing degree-days: one equation, two interpretations. Agricultural and Forest Meteorology 87: 291-300", please send a personal e-mail (not by hitting reply to his mail !!) to:
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He kindly agreed to send you complimentary copies of the article.
Thanks


Saseendran S Anapalli,  Ph. D.
Agricultural Systems Research Unit
USDA-ARS
2150 D Center Ave.
Fort Collins, CO-80526

-----Original Message-----
From: DSSAT - Crop Models and Applications [mailto:[log in to unmask]] On Behalf Of Victoria Lenz
Sent: Wednesday, June 13, 2007 2:49 AM
To: [log in to unmask]
Subject: Re: TEMPERATURE TO GDD

Dear Misael,

numerous variants on the subject of temperature sums based on linear
functions are published.
MCMASTER & WILHELM (1997) point at the need for clear definitions
regarding the concept of growing degree-days.
Different methods of calculating growing degree-days implemented in crop
models can easily
cause errors when relying on parameters from literature.
Maybe you would like to look at this article:
MCMASTER, G.S. & W.W. WILHELM (1997): Growing degree-days: one equation,
two interpretations. Agricultural and Forest Meteorology 87, 291-300.

Greetings from Germany,
Victoria



Misael Rodriguez Arvizu schrieb:
> DEAR ALL:
>
>
> FOR CALCULATE GROWING DEGREE DAYS (GDD) IS USED,    /Tmean -Tbase/ BUT
> I HAVE A DUDE, WHAT IS THE BEST USEFULL MEANS OF DATA IN 24 HOURS OR
> ONLY TO USE  /(Tmax+ Tmin)/2/
>
>
>
> ANYBODY HELP ME
>
>
>
>
>
>
> MISAEL RODRIGUEZ ARVIZU
>
> UNIVERSIDAD AUTONOMA AGRARIA ANTONIO NARRO,
>
> BUENAVISTA, SALTILLO, COAHUILA, MEXICO.
>

--
Dipl.-Geogr. Victoria Lenz

Universität zu Köln
Geographisches Institut
Albertus-Magnus-Platz
50923 Koeln
Tel.: +49-(0)221-470-6823
Fax:  +49-(0)221-470-5124