Nitrogen use by winter wheat and changes in soil nitrate nitrogen levels with supplemental irrigation based on measurement of moisture content in various soil layers

文献类型： 外文期刊

第一作者： Guo, Zengjiang

作者： Guo, Zengjiang;Zhang, Yongli;Shi, Yu;Yu, Zhenwen;Zhao, Junye

作者机构：

关键词： Grain yield;Nitrogen use efficiency;Supplemental irrigation;Soil nitrate nitrogen;Winter wheat

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

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收录情况： SCI

摘要： In northern China, water sources are one of most limiting factors for agricultural development, particularly for winter wheat. Optimizing supplemental irrigation (SI) to achieve the ideal soil moisture content and nutrient uptake by plants is therefore highly important in this region. The present study investigated how various SI regimes affect nitrogen use in winter wheat and alter soil nitrate nitrogen (NO3-N) content under field conditions. The soil relative water content (SRWC) of the 0-20 cm (D20), 0-40 cm (D40) and 0-60 cm (D60) soil layers was raised to 70% by supplemental irrigation at jointing and anthesis, and a non-irrigated, rain-fed (R-F) condition served as the control. The highest grain yields of 9648.4 kg ha(-1) in 2011-2012 and 10,032.2 kg ha(-1) in 2012-2013 were obtained in D40, which had higher nitrogen use efficiency (NUE) than R-F, D20 and D60. NUE was positively correlated with nitrogen translocation efficiency (NtE) and nitrogen fertilizer productivity (NIP) but not with nitrogen uptake efficiency (NupE). These results indicated that optimizing the SI regime improved NUE primarily by increasing nitrogen uptake and translocation and thereby raising NtE and NIP. The soil NO3-N content was lower in D40 than in R-F, D20 and D60 in the 0-200 cm soil layers, indicating that NO3-N leaching was the lowest in D40. Thus, the optimal SI regime, which consisted of irrigating SRWC in the 0-40 cm soil layer to 70% at jointing and anthesis, reduced NO3-N leaching and increased NUE and NIP in winter wheat. (C) 2014 Elsevier B.V. All rights reserved.

分类号： S

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