Water use, growth and yield of water stressed and irrigated mungbean (Vigna radiata L. Wilczek) at different growth stages and two planting densities
1988
Abdul Majled Haqqani
Results indicated decrease in water use by mungbean with increasing drought stress. Irrigation at vegetative and pod filling stage (I3) at high planting density had marked influence on LAI [leaf area index] increase giving highest yield among other treatments. Decrease in amount of water in the soil and high planting density decreased NAR [net assimilation rate] and increased SLW [specific leaf weight]. CGR [crop growth rate] was also decreased by water deficits. LAI, CGR and NAR were not affected by irrigation schedules. Leaf water potential (LWP) and osmotic potential decreased with increase in moisture stress. Irrigation schedules and planting densities had no effect on these parameters. Canopy temperature (Tc) and LWP were highly correlated. Tc was also highly correlated with grain yield. Tc increased with increase in drought stress and there was no effect of planting densities on it. It indicated that Tc and LWP can be used to quantify drought stress effects on mungbean. Most of the roots were found in upper layer 0-60 cm in wet regimes and in dry regimes more roots were observed in deeper layers. Irrigation schedules had no effect on vertical and horizontal root distribution. The results also indicated that mungbean is a suitable crop to be grown after rice with no irrigation or one irrigation at flowering stage or one irrigation at vegetative and one at pod-filling stage if irrigation water is available to get higher grain yields. Higher planting densities could give higher yields under mild drought stress conditions.
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