Sesame was grown for two successive seasons (2001/2002 - 2002/2003) at Shambat, Sudan. The aim of the study was to investigate five irrigation water quantities on actual evapotranspiration as compared with estimated evapotranspiration using Penman-Monteith method, modified Penman formula and pan evaporation. Water use efficiency and crop factors were calculated and the best water use efficiency was obtained under irrigation water 650 mm. Under all irrigation treatments, there was a large deviation of pan evaporation, modified Penman and Penman-monteith estimate from actually measured evapotranspiration. Crop coefficients were decreased with decreased water quantities in all treatments. Crop coefficients computed by pan evaporation were under all circumstances, lower than these obtained by modified Penman and Penman- Monteiths methods.
Key words: Water quantities, consumptive use, water use efficiency, crop coefficient, sesame.
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