Effect of Drought Stress and Leaf Characteristics and Quality of Soybean Cultivar Williams

A split plot experiment in form of fully random blocks with three repetitions was carried out to survey effect of water deficit and defoliation on qualitative and quantitative traits of soy cultivar (Williams). Main factors were three water deficit tension (1a: 60mm evaporation from evaporation basin, a: before reproductive growth of irrigation similar to first experiment at the initiation of reproductive stage until harvest based on 150mm evaporation from the basin, 3a: irrigation up to V3 growth stage followed by irrigation with rate of 150mm evaporation from evaporation basin) and sub-factors of variation in resource and reserve (b1: control group, b2: 33% defoliating, b3: 66% defoliating) were also investigated. The traits under consideration in the experiment were yield, weight of 1000 seeds, number of seeds in calyx, proline and super oxide enzyme of dismutase. Variance analysis of the traits under study found to be significantly affected by water deficit and defoliation tension. Under water deficit tension, the plant showed antioxidant enzyme activity increase due to oxidative tension effects, such as dismutase super oxide. In addition defoliation resulted in reduction of dismutase super oxide enzyme activities. Seed yield under water deficit tension (4309kg/104m) showed considerable decrease. Under defoliation V3 it was found that water deficit tension decreased after defoliation increase to 66% of yield.