Abstract
Field experimentswere conducted to study the effect of initial moisture stress levels (65,80 and 95% of available moisture ) on three different wheat varieties ( Pak-81, Khyber-87, and Pirsabak-85 ) on silt loam soil at NWFP Agricultural University’s farm, Peshawar, Pakistan, during Rabi season of 1990-91. Consumptive use was worked out as a sum of soil moisture depletion between sampling, taking into consideration, the contribution of rainfall, amount of irrigation waterappliedanddeep percolation.Consumptive useof water for wheat was 365,355and327mm and average seasonal crop coefficients (KJ were 1.058, 1.028 and 0.973 at 65, 80 and 95% depletion of available soil moisture, respectively. The results obtained showed that there was not significant difference in yield and its componentsdue to various initial moisture stress levels maintained before first irrigation.However, the average yield at higher stress level (95% ) was 5 percent less than that of low stress level (65% ). The highest yield of 3450 kg/ha and maximum water use efficiency of 9.72 kg/ha/mm was obtained for variety Khyber-87 which was irrigated 24 days after sowing at 80% depletion of available soil moisture.
Published Version
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