农学
灌溉
人类受精
稻草
氮气
亏缺灌溉
环境科学
野外试验
用水效率
化学
生物
灌溉管理
有机化学
作者
Mamdouh A. Eissa,Nadia M. K. Roshdy
标识
DOI:10.1080/01904167.2018.1549676
摘要
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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