الفهرس 
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Abstract
growing summer seasons in the Agric. Res. Station of the Fac. of Agric .,Ain shams Univ. located at Shalakan, Kalubia Governorat, Egypt. Three field trials were performed in every growing season.The first, the second and the third trials were devoted to study, the response of mung bean (Vigna radiata (L.) Wilck.) cv. Kawmy-1 to the combination between three levels of P2 05 (15, 30 and 45 kg/fed.) and two amounts of water, i.e. 80% KC of soybean x ET (Ir1) and 60% KC of soybean x ET (Ir2) under sprinkler, drip or modified flooding
·’· irrigation systems
The amount of water added for Ir1 and Ir2 treatments
was 1774.3 and 1330.5 m3 per fed. In the first season and
1543.7 and 1157.8 m3/fed, in the second season, respectively.
Plant height as well as number of branches, leaves and pods and their fresh and dry weight were considerably and consistently increased as the plant age increased from 45 to 75 days from planting. Growth parameters responded positively to P205 dose applied at 45, 60 and 75 days from planting, for example, in the first season, mung bean height amounted to
’ · 102.3, 106.6 and 111.2 em at 45 days; 136.3, 144.9 and 151.2 em at 60 days and 144.9, 157.6 and 163.9 em at 75 days from planting, respectively, for plants supplied by 15, 30 and 45 kg
P205/fed. The same trend was realized for the other growth traits recorded. Water regime, i.e. Ir1 and Ir2 reflected no significant effect on any of the growth traits
r
studied.Morover,non of the mung bean yield attributes was
considerably affected by water regime applied (Ir 1 or Ir2). Biomass, economic yield, seed index or harvest index revealed no significant response due to water regime treatments
.Number of pods per plant, weight of pods per plant and seed weight per plant increased by increasing phosphatic fertilizer from 15 to 45 kg P2 0s/fed., respectively. Biological and economic yields elucidated a consistent increase with increasing P205 added to mung bean. Seed index and harvest index followed the same trend of change.
The heaviest biomass yield was realized by adding 45 kg Pz05/fed. under flooding system being 8.01 and 8.90 t/fed. in the first and second seasons, respectively. On the contrary, reproductive growth of mung bean (yield of pods and yield of
seeds) was enhanced considerably by adding 45 kg P2 05/fed. under sprinkler irrigation.Seed index (g/1000 seed) was significantly affected by the interaction between irrigation system and irrigation regime whereas the highest values were realized by growing mung bean plants under low amount of water (Ir2 ) in both seasons under sprinkler irrigation system interaction effect of phosphatic fertilizer dose and water regime did not exert significant effect on yield of seed in the first season, whereas in the second one, highest yield was obtained by adding 45 kg P205/fed. and supplied by low
amount of water (Ir2 , 1157.3m3/fed.). Harvest index was not
significantly affected. (water use efficiency) WUE amounted to 0.11, 0.13 and 0.15 kg seed 1m3 water in the first season and
0.17, 0.19 and 0.24 kg seed/m3 water in the second season for plants supplied by15, 30 and 45 kg P2 05/fed., respectively. PUE followed similar response to P205 dose.as that of WUE.