الفهرس 
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Abstract
ABSTRACT
Two field experiments were conducted at the Research and Experiment Center, Fac. Agric., Moshtohor, Benha Univ., Qaluibia Governorate, Egypt, during ( 2018 and 2019)summer seasons, to study the effect of four water regimes i.e , two irrigation at flowering and pod formation stages (40 and 80) day after planting (DAP),four irrigation at vegetative growth, beginning of flowering, beginning of pod formation and full pod formation stages (30, 60, 90 and 120 DAP, respectively), six irrigations at vegetative growth, beginning and full pod formation , full pod formation and full seed formation stages(30,50,70,90,110 and 130 DAP, respectively) and normal irrigations (8 regular subsequent irrigations as a control) as well as biochemical studies on some Soybean (Glycine max L. Merrill ) varieties (Giza 21 , Giza 35, Giza 111 and Crawford ) on yield, yield components and chemical compositions of soybean varieties in both seasons.
The treatments were arranged in a split-plot design with four replications. Irrigation regimes were distributed at random in the main plots while, soybean varieties occupied the sub-plots. The sub-plot area was 10.5 m2 consisted of 5 ridges of 3.5 m long and 60 cm width.
Data exerted that all different treatments clarified a significant differences with these traits compared with control plants. It can be summarized as follows:
1- All traits under study were significantly increased by increasing number of irrigations as compared with the lowest number of irrigation in both seasons respectively.
2- Soybean varieties were significantly different in all of the studied traits in both seasons except total chlorophyll content and straw yield (Kg fed-1) in soybean in the first season, and leaf area plant-1 in the second season.