Effect of nitrogen rates on drip irrigated maize grown under deficit irrigation |
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| Authors: | Mamdouh A Eissa Nadia M K Roshdy |
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| Institution: | Department of Soils and Water, Faculty of Agriculture, Assiut University, Assiut, Egypt |
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| Abstract: | Nitrogen fertilization management under water limited conditions needs to be refined to save environmental ecosystems and increase economic returns. Two-year field studies in a split-plot design were conducted to investigate the response of maize to different nitrogen rates (N100 = 100, N130 = 130, and N160 = 160?kg N ha?1) under two irrigation levels (100 or 75% of water requirements). Under deficit irrigation, water and N were used more efficiently than normal water supply. N-fertilization of drip irrigated maize grown under deficit irrigation with N160 increased the uptake of N, P and K by 35, 29 and 70% compared with N100. Fertilization of maize grown under deficit irrigation with N160 increased the grain, straw and biological yield and water use efficiency by 50, 14, 22 and 33% compared with N100. Based on the obtained results, 160?kg of N ha?1 is the optimum rate of N for maize irrigated by 75% of water requirements. |
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| Keywords: | drip irrigation maize yield N use efficiency nutrients uptake water stress water use efficiency |
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