PERFORMANCE OF SOME MUNG BEAN VARIETIES UNDER DIFFERENT LEVELS OF IRRIGATION

Abstract

Two field experiments were conducted in the Agricultural Experimental Station of the National Research Centre at Shalakan, Kalubia Governorate during 1996 and 1997 seasons in a controlled surf ace irrigation network. Each experiments included 12 treatments which were the combinations of four irrigation water amounts and three mung bean varieties, i.e. Kawmy-1, Giza-1 and NCM-69 in a split plot design. Increasing irrigation water amounts increased significantly plant

height; No. of branches; fresh weight of leaves, stem, roots, pods and total fresh weight I plant; dry weight of leaves, stem and total plant dry weight. However, No. of leaves and pods I plant as well as dry weight of pods I plant were decreased by higher amounts of irrigation water. Moreover, leaf area (LA), leaf area index (LAI), plant height at harvest and carbohydrates % in seeds were increased by increasing amounts of irrigation. On the other hand, the lowest amounts of irrigation resulted in increase of No. of shuttered, mature and total No. of pods I plant; No. of seeds I plant; weight of pods I plant; weight of seeds I plant; seed index; crop index; harvest index; shelling %; biological, straw and seed yields I fed as well as water use efficiency (WUE). Furthermore, yields of carbohydrates and protein I fed were increased with the lowest amount of irrigation. Irrigation with the medium levels increased significantly specific leaf area (SLA), specific leaf weight (SLW), net assimilation rate (NAR) and relative growth rate (RGR). Whereas, crop growth rate (CGR); N, P, K and protein percents were not significantly affected by irrigation.

Kawmy-1 mung bean variety was significantly superior in some growth and yields criteria as well as WUE. On the other hand, Giza-1 variety showed significant superiority in most growth and yield characters, WUE; seed carbohydrates and K percents and both carbohydrates and protein yields I fed. Whereas, NCM-69 mung bean variety was significantly superior in some growth and yield parameters. There were negative significant correlations between seed yield fed. and plant height at different growth stages and at harvest. Whereas, positive significant correlations were obtained between seed yield I fed. and each of No. of leaves I plant; total dry matter I plant; LA; SLW ; NAR; RGR ; CGR in some growth stages as well as biological yield I fed. and WUE in both seasons.