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Estimates of Crop Evapotranspiration in Egypt
Author(s) -
FAULKNER RICHARD D.
Publication year - 1988
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.1988.tb01354.x
Subject(s) - evapotranspiration , energy balance , water balance , agriculture , work (physics) , irrigation , crop , environmental science , balance (ability) , bowen ratio , agricultural engineering , water resource management , hydrology (agriculture) , geography , mathematics , forestry , agronomy , engineering , ecology , mechanical engineering , geotechnical engineering , archaeology , biology , medicine , physical medicine and rehabilitation
SYNOPSIS T he WORK DESCRIBED is part of a feasibility study for the rehabilitation of the Old Lands irrigation areas in Egypt. Despite much previous work there is still some controversy regarding the consumptive use of water by crops in Egypt. The present study utilized the Energy Balance (sometimes also called Bowen Ratio) method to determine the actual evapotranspiration occurring over crops. It was found that the modified form of the Penman equation recommended by the Food and Agriculture Organization overestimated evapotranspiration by approximately 30 per cent. Alternatively, the use of an earlier form of the Penman equation yielded acceptable estimates.