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Predicting Water Needs of Wheat from U.S. Class A Pan Evaporimeter at Pantnagar, India*

Published online by Cambridge University Press:  03 October 2008

Pyare Lal  and
K. C. Sharma
Pyare Lal
Affiliation:
Department of Agronomy, G. B. Pant University of Agriculture and Technology, Pantnagar-263145, India
K. C. Sharma
Affiliation:
Department of Agronomy, G. B. Pant University of Agriculture and Technology, Pantnagar-263145, India
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Summary

In field experiments at Pantnagar, India during 1968–70, evapo-transpiration (ET) in wheat was significantly correlated with U.S.W.B. class A pan evaporation (E0) when the crop was in an active stage of growth and moisture was non-limiting (50 or 25% depletion of available moisture). The estimated ET was higher than E0, probably due to ‘oasis’ and ‘clothesline’ effects. When ET measurements were made at varying distances from the upwind side during the subsequent three years, it was found that ET decreased with increasing distance downwind with a conspicuous border effect up to about 25 m distance. In the absence of advective heating, i.e. in extreme downwind locations, the actual ET was 480, 533 and 530 mm during 1970–71, 1971–72 and 1972–73 respectively.

Type
Research Article
Information
Experimental Agriculture , Volume 12 , Issue 1 , January 1976 , pp. 23 - 31
Copyright
Copyright © Cambridge University Press 1976

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