One-time N fertilization reduces greenhouse emissions and N leaching while maintaining high yields in a rape-rice rotation system

文献类型： 外文期刊

第一作者： Ding, Wuhan

作者： Ding, Wuhan;Zhang, Guilong;Ding, Wuhan;Lei, Haojie;Zhang, Jing;Wang, Ligang;Zhang, Jianfeng;Li, Hu;Lei, Haojie;Zhang, Jing;Ju, Xuehai

作者机构：

期刊名称：AGRONOMY JOURNAL （ 影响因子：2.65； 五年影响因子：2.963 ）

ISSN： 0002-1962

年卷期： 2022 年 114 卷 1 期

页码：

收录情况： SCI

摘要： In China, the rice (Oryza sativa L.)-rapeseed (Brassica napus L.) rotation system is facing great challenges, including constantly growing demand, on-going labor shortages, and increasing environmental burdens. Thus, producing more food and higher benefits while minimizing environmental costs is required for future development. A 2-yr field experiment comparing three nitrogen (N) fertilization treatments (non-N treatment as control [CK], conventional urea application [CU], one-time application of controlled-release urea [CRU]) was performed. Results showed that the rice season dominated annual CH4 emissions (>95%) and on average contributed more than 50% of the annual N2O emissions. Additionally, the main forms of mineral N leaching were different for rape and rice. Nitrate (NO3-)-N was the major component of leaching in rape season, while for rice season NO3--N and NH4+-N were equal. Relative to CU, CRU significantly increased the rapeseed yield by 10.7 similar to 13.9% and maintained the rice productivity, reduced mineral N leaching losses by 19.6 similar to 20.8% for the rice season, and resulted in less total methane (CH4) and nitrous oxide (N2O) emissions (TGHGs) by 12.1% across the two rotations. Furthermore, a net economic benefit (NEB) considering yields, fertilizer input, labor, and other input costs indicated CRU increased the economic return by 58.3%. However, CRU did not improve partial factor productivity of nitrogen fertilizer (PFPN) and decreased the NEB by 3.1% without considering the labor cost. It indicated a one-time application of the CRU for rice-rapeseed rotation system was an environmentally and economically profitable technology. This paper provided a promising solution for farmers to enhance rice-rapeseed productivity and increase income while minimizing the environmental footprint.

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