Comparison of pan-evaporation and modified penman methods for the estimatin of crop-water requirement
1987
Palaskar, M.S. | More, S.D. | Varade, S.B. (Water and Land Management Inst., Aurangabad (India))
The estimates of reference crop evapotranspiration (ETo), 75% dependable ETo, consumptive use of water by different crops (Cu) net irrigations requirement (NIR) at root zone for different crops and peak NIR for design purpose by modified Penman method were 8 to 10% higher than the pan-evaporation method. For all the parameters, on an average, the ratio of an estimate by the pan-evaporation method to the estimate by modified Penman method was 0.9. Pan-evaporation and modified Penman methods showed a strong correlation for their estimates of ETo (r=0.88** ). Hence pan-evaporation method is recommended for the design of irrigation schemes if adequate and representative meteorological data required for the method of modified Penman are not available. However, there is a need to process large data for diversified climate and crops in Maharashtra by these 2 methods for their better comparison and further recommendations
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