期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 24, 期 3, 页码 2549-2557出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-016-8031-0
关键词
Nitrogen recovery efficiency; Maize; Water use efficiency
Knowledge of the dynamics of plant nitrogen (N) uptake at varying irrigation water levels is critical for strategizing increased N recovery efficiency (NRE), water use efficiency (WUE), and maize yield. The N dynamics were studied under various irrigation regimes to evaluate NRE, WUE, and maize yield. A pot experiment was conducted using three irrigation water regimes (50, 75, and 100% field capacity (FC)) and four N fertilizer rates (0, 1.6, 3.2, and 4.8 g pot(-1)) applied with two fertilizer application methods including foliar and soil applications. The highest plant growth and grain yields were achieved by application of 4.8 g N pot(-1) with 100% FC. Contrarily, the maximum WUE (7.0 g L-1) was observed by the lowest irrigation water (50% FC) with the highest N fertilizer rates (4.8 g pot(-1)). Nitrogen concentration in the stem and grain was linearly increased by increasing N fertilizer rates with irrigation water. However, in the root, N concentration was decreased when the crop was supplied with 100% FC. In plant, maximum N uptake (6.5 mg g(-1)) was observed when 4.8 g N pot(-1) was applied with 100% FC. Nitrogen recovery efficiency was increased by increasing N rate up to 3.2 g pot(-1) with 100% FC. Therefore, for achieving maximum WUE and NRE, the highest water and N applications, respectively, are not necessary.
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