Analysis and evaluation of irrigation application efficiency and distribution uniformity
2003
Ahmad, N. | Ali, M. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Water Management)
The results indicated that location and type of crop had a significant effect on irrigation application efficiency. Similarly crop type had a significant effect on distribution uniformity, however location had an insignificant effect on distribution uniformity. Higher application efficiencies (greater than 60%). were found in fields with clay loam soils, and less than 51% in fields with gravelly silt loam and sandy loam soils. Higher Ea values were found for fields planted to higher water demanding crops. Furrow irrigated row crops had higher Ea compared to basin irrigated crops. Deep percolation loss was the significant factor affecting application efficiency. The lowest application efficiency (36%) was found for the highest deep percolation in wheat crop. The resulting values of linear correlation coefficients and power curve, R2, showed that application efficiency was negatively related to field area. flow rate, soil moisture deficit and deep percolation. Negative correlation existed between distribution uniformity and stream size. The distribution uniformity was affected more by stream size compared to other factors. Water supplied to crops should be frequently adjusted according to their requirements. The application efficiency and distribution uniformity were correlated and these tended to vary in the same direction.
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