الفهرس 
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Abstract
This study was conducted at the research farm of faculty of agriculture, University of Fayoum, Egypt during 2013/2014 and 2014/2015 seasons. The objectives of the study are to study the effect of irrigation intervals, sowing dates, faba bean varieties and their interactions on growth, yield, yield components and chemical analysis to explore the best treatment combination for the newly reclaimed soil at El-Fayoum, Egypt. A split- split plot design was used with three replicates. The irrigation intervals of 20, 30 and 40 days were assigned to main plots, the three sowing dates (22nd October, 7th November and 22nd November) were assigned to the sub plots while the faba bean varieties (Nubaria 1, Nubaria 2, Giza 3 improved, Sakha 1 and Sakha 2) were assigned to the sub-sub plots.
Irrigation intervals had a significant effects on plant height at 81 and 102 days after sowing, leaves number per plant at 81 days after sowing, leaf area cm2 per plant at 60 and 102 days after sowing, dry weight/plant at 60, 81 and 102 days after sowing, crop growth rate, leaf area ratio, relative growth rate and net assimilation rate at 60-81 and 81-102 periods. At harvest irrigation every 20 days appeared the superiority on plant height, seed yield, harvest index (37.45) and carbohydrate% while the superiority went to irrigation every 30 days on height to first pod and 100- seed weight, meanwhile, the greatness on number of branches and pods, seed weight per plan, straw yield and protein% were achieved by 40 days.
Sowing dates led to significant differences in plant height, number of leaves per plant, leaf area per plant and total dry weight at 60, 81 and 102 days after sowing leaf area ratio, crop growth rate, relative growth rate, net assimilation rate at two growth stages also days to 50% flowering. At harvest early sowing (22nd October) possessed the superiority in plant height, height of first pod, pods number, number of branches per plant, pods and seed weight per plant, 100- seed weight, seed yield per t. /fad., straw yield t. /fad. and carbohydrates percentage while late sowing date (22nd November) achieved the superiority in harvest index and protein.
Also, results at faba bean varieties showed that, there were significant differences in plant height, number of leaves per plant, leaf area per plant and total dry weight per plant at 60, 81 and 102 days after sowing, leaf area ratio per plant, crop growth rate, net assimilation rate and relative growth rate at 60-81 and 81-102 periods, days to 50% flowering. At harvest Nubaria 1 variety possessed the dominance in number of branches, weight of pods per plant, weight of seeds per plant, 100- seed weight, seed yield, straw yield and carbohydrate% While, Giza 3 improved owned the superiority in plant height. As Nubaria 2 variety achieved the first order in height to first pod and number of pods per plant. The superiority in harvest index and protein% was obtained by Sakha 1 variety.
The interactions, between each two factors and between the three factors together were significant for most of the characters under study in most of growth stages or periods, as well as, at harvest