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Two field experiments were carried out at the Farm of Environmental Studies and Research Institute, Sadat City University, during the two successive seasons of 2013 and2014,to study the effect of bentonite as soil amendment under three levels of irrigation water on plant growth characteristics as plant height, number of branches , fresh weight per plant, yield and yield component as 100-seed weight, seed yield per plant and total seed yield per feddan and mineral contents of seeds (N,P,K, Fe, Mn and Zn)of three cultivars of cowpea (Vigna unguiculata, L. i.e., Kafr El-Sheikh , Kareem7 and Kareem 14under drip irrigation system. The experiment was conducted under three levels of deficit irrigation levels which were(60,80, and 100% of soil moisture content at field capacity) ,bentonite was added to soil before planting at the rate of 0, 6 and12ton/fed..Spiltspilt plots design in a randomized complete blocks with three replicates was used. Results showed that the application of bentonite as a soil amendment to soil at the highest level (12 ton/fed.) Significantly increased vegetative growth, yield and its components as well as mineral contents of seeds in both seasons compared with the control. As for the effect of irrigation levels, the highest level of irrigation100%of soil moisture content at field capacity (4057 m/fed.)Significantly increased vegetative growth, yield, yield components and chemical composition of seeds. In addition, cv. Kareem7 recorded the highest values of all tested parameters i.e., vegetative growth, yield and yield components as well as mineral contents of seeds than cvs. Kafr El-Sheikh and Kareem 14in both growing seasons. The interaction between bentonite amendment and the high irrigation level with cv. Kareem7 significantly increased vegetative growth, yield and its components as well as mineral contents of seeds in both seasons.

annals of agricultural science, moshtohor

Effect of water use efficiency and bentonite levels on growth, yield and chemical composition of seeds for cowpea (Vigna unguiculata,l.) cultivars grown in sandy soil