EFFICIENCY OF SURFACE IRRIGATION

Abstract

The present study is concerned with the prediction and field verification of Eg combines the characteristics of traditionally used irrigation efficiencies: application efficiency E3 storage efficiency (Es). Thus, it is possible to compare the performance of different water application systems and/or design and management scenarios using a single index. The relationships of E. VS. Ea and E are also presented using a transpiration fraction (a) which is defined as the ratio of transpiration to evapotranspiration. When E alone equals 100%, frequently too much irrigation or rainfall occurs, resulting in considerable deep percolation. When Ea equals 100%, the irrigation or the rainfalls, in most cases, are inadequate, resulting in complete under-irrigation. The FAO recommended crop coefficients for crop is used to compute crop evapotranspiration. The daily crop evapotranspiration is partitioned into evaporation and transpiration on basis of observed leaf area index