Identifying the critical nitrogen fertilizer rate for optimum yield and minimum nitrate leaching in a typical field radish cropping system in China

文献类型： 外文期刊

第一作者： Zhang, Jiajia

作者： Zhang, Jiajia;He, Ping;Ding, Wencheng;Ullah, Sami;Abbas, Tanveer;Ai, Chao;Zhou, Wei;Li, Mingyue

作者机构：

关键词： Radish yield; Nitrate residue; Nitrogen use efficiency; Nitrate leaching; Critical nitrogen application rate

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2021 年 268 卷

页码：

收录情况： SCI

摘要： Nitrate leaching caused by overusing or misusing nitrogen (N) fertilizers in field vegetable cropping systems in China is a leading contributor to nitrate contamination of groundwater. Identification of the critical fertilizer N input rate could support management decisions that maintain yields while reducing the impact of nitrate leaching on groundwater. A four-season field experiment involving six N treatments (0, 60, 120, 180, 240, and 300 kg N ha(-1)) was undertaken to investigate the impacts of various N rates on N use efficiency (NUE), seasonal nitrate leaching loss (SNLL), nitrate residue (NR), and radish yield, and to identify the critical N fertilizer rate for both optimum yield and minimum nitrate leaching loss in a field vegetable (radish, Raphanus sativus L.) cropping system in northern China. The results showed that radish yield enhanced quadratically and NUE reduced linearly with increasing N addition, while the NR and SNLL increased exponentially. The yield did not increase markedly when N fertilization exceeded 180 kg N ha(-1). SNLL and nitrate concentrations in the leachate averaged 11.5-71.5 kg N ha(-1) and 5.1-35.6 mg N L-1, respectively, under N rates of 60-300 kg N ha(-1). The results showed that N fertilizer rate ranging from 180 to 196 kg N ha(-1) resulted in high yields and low nitrate leaching losses. Compared with those in response to the N fertilizer amount applied by local farmers, the NUE, NR, and SNLL in response to the N fertilizer amount identified in this study increased, decreased by 30.9%-35.0%, and decreased by 49.9%-55.7%, respectively, without any yield loss. Thus, a critical N fertilizer rate ranging from 180 to 196 kg N ha(-1) is recommended to obtain optimum yields with minimal environmental risks in radish fields in northern China. (C) 2020 Elsevier Ltd. All rights reserved.

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