Optimizing nitrogen input and nitrogen use efficiency through soil nitrogen balance in a long-term winter wheat-summer maize rotation system in North China

文献类型： 外文期刊

第一作者： Xu, Mengze

作者： Xu, Mengze;Wang, Yuhong;Wang, Lei;Bai, Youlu;Lu, Yanli;Zhang, Yinjie

作者机构：

关键词： Crop yield; Critical nitrogen balance; Nitrogen use efficiency; Nitrogen input-output framework; Critical nitrogen application rate

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.2； 五年影响因子：5.9 ）

ISSN： 1161-0301

年卷期： 2023 年 149 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) fertilizer application has revolutionized agricultural productivity, but excessive N fertilizer application has resulted in low N use efficiency (NUE) and high N accumulation, increasing the risk of N losses. Here, we hypothesize that the apparent N balance can be used as an indicator to identify the N input for obtaining high yield with a high NUE. Thus, a 12-year field experiment involving seven N treatments (0, 120, 240, 360, 480, 600, and 720 kg N ha-1 per year) in a typical winter wheat-summer maize rotation system in North China was conducted to investigate the response of crop yield and NUE to the N balance under different N application rates and to identify the N input-output framework. The annual yield increased in a linear-platform and NUE decreased with increasing N fertilizer application. The N balance and yield are strongly correlated to predict changes in yield, and a critical N balance of 44.4-64.9 kg N ha-1 per year was recommended for optimal yield with minimal risk of N loss. The N balance and NUE can be presented in the framework of N input-output, and the critical N input estimated from the N balance of 217-252 kg N ha-1 could obtain high productivity with high NUE (74.3-79.6 %). Overall, the apparent N balance could be used as a key indicator for optimizing N input, providing a strong reference for limiting N excess in intensive production areas and evaluating agronomic and environmental performance in N management. Data Availability: The datasets generated during and analyzed during the current study are available from the corresponding author on reasonable request.

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