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۱Role of Cobalt on Cowpea Growth and Yield under Different levels of Nitrogen
اطلاعات انتشار: World Applied Sciences Journal، بيست و دوم،شماره۴، ۲۰۱۳، سال
تعداد صفحات: ۹
Two field experiments were carried out to evaluate role and importance of cobalt under different levels of nitrogen on nodules efficiency, growth, yield, minerals composition and chemical characteristics of cowpea plants. The experiments were conducted at Research and Production Station, National Research Centre, El–NobariaBeheara Governorate, Delta– Egypt, under drip irrigation system during 2011 and 2012 seasons.The obtained results are summarized in the following:–Cobalt significantly increased nitrogenous activity which was parallel and related to the increased nodules numbers, weights of cowpeaand its efficiency especially with both 100 and 75% nitrogen fertilizer.–Cobalt gave the highest figures of all growth and yield parameters of cowpea with 100% N followed by 75% N compared with the untreated plants.–Growth and yield parameters of cowpea treated with cobalt and 50% N was not significant while cobalt with 25% N gave the lowest figures. –Cobalt increased the efficiency of nitrogen fertilization, amendment reduce the recommended dose of about by 25% and resulted in superior cowpea pods and seeds yield about by 25.6 % and 18.84 with75% N respectively, compared with 100 N without cobalt. –Cobalt significantly increased the content of N, P, K, Mn and Zn as well as chemical contents especially with 100% and 75% nitrogen levels. Finally, the addition of Cobalt to the soil, save 25% nitrogen fertilizer and could be reduced the nitrogen environmental pollution and induced the agricultural cost for more money of farmers.
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