数字农科院2.0

Predicting the Nitrogen Quota Application Rate in a Double Rice Cropping System Based on Rice-Soil Nitrogen Balance and N-15 Labelling Analysis

文献类型： 外文期刊

作者： Cao, Xiaochuang;Qin, Birong;Ma, Qingxu;Zhu, Lianfeng;Zhu, Chunquan;Kong, Yali;Tian, Wenhao;Jin, Qianyu;Zhang, Junhua;Yu, Yijun

作者机构：

关键词： early and late rice;N uptake;N use efficiency;rice-soil system;N-15 isotopic labelling

期刊名称： Agriculture-Basel

ISSN：

年卷期： 2023 年 13 卷 3 期

页码：

收录情况： SCIE（2023版）

摘要： Excessive nitrogen (N) fertilization, low use efficiency, and heavy pollution are the dominant issues that exist in intensively cultivated double rice cropping systems in China. Two-year field and N-15 microregion experiments were conducted to evaluate the N fate in a soil-rice system under a series of different N rate treatments from 2020 to 2021. The economic N application rate that simultaneously improved rice yield and N use efficiency in the rotation system was also investigated. Results demonstrated that soil residues and mineralized N accounted for more than 58.0% and 53.2% of the total N input in the early and late rice seasons, respectively. Similarly, most of the total N input was absorbed by rice, ranging from 43.7% to 55.6% in early rice and from 36.8% to 54.7% in late rice. Rice N use efficiency significantly decreased with increasing N application, while rice grain yield and its N uptake increased when the N application rate was below 150 kg ha(-1) in early rice and 200 kg ha(-1) in late rice. Exceeding this point limited rice N uptake and yield formation. The apparent N recovery rate, N residual rate, and N loss rate were 23.5-34.4%, 17.0-47.1%, and 26.0-47.8% for the early rice, and 32.8-37.3%, 74.2-87.0%, and 71.5-92.1% for the late rice. The linear plateau analysis further indicated that the recommended N application rate (118.5-152.8 kg ha(-1) for early rice and 169.9-186.2 kg ha(-1) for late rice) can not only maintain a relatively higher rice yield and N utilization but also significantly reduce soil N residue. Our results provide theoretical guidance for improving N management in double-cropping rice fields in southern China.

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