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Soil mineral nitrogen, soil urease activity, nitrogen losses and nitrogen footprint under machine-planted rice with side-deep fertilization

文献类型： 外文期刊

作者： Zhong, Xuemei 1 ; Zhou, Xuan 5 ; Luo, Gongwen 1 ; Huang, Ying 1 ; Wu, Yuanfan 6 ; Cao, Ruliang 7 ; Tian, Chang 1 ; Peng, Jianwei 1 ;

作者机构： 1.Hunan Agr Univ, Coll Resources, Hunan Prov Key Lab Farmland Pollut Control & Agr R, Changsha 410128, Peoples R China

2.Hunan Agr Univ, Hunan Prov Key Lab Plant Nutr Common Univ, Changsha 410128, Peoples R China

3.Hunan Agr Univ, Natl Engn Res Ctr Efficient Utilizat Soil & Fertil, Changsha 410128, Peoples R China

4.Hunan Biol Electromech Vocat Tech Coll, Changsha 410127, Peoples R China

5.Hunan Acad Agr Sci, Inst Soil & Fertilizer, Changsha 410125, Peoples R China

6.Hunan Prov Agr Comm, Changsha 410005, Peoples R China

7.Heshan Agr & Rural Bur, Yiyang 413000, Peoples R China

关键词： Emission factor; Environmental risk; Nitrogen-application rate; Nitrogen footprint; Nitrogen loss; Paddy field

期刊名称：PLANT AND SOIL （ 影响因子：4.9； 五年影响因子：5.2 ）

ISSN： 0032-079X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： AimsReduction of the nitrogen (N) footprint of agroecosystems is currently a hot topic in various research disciplines and fields. However, the effect of machine-planted rice with side-deep fertilization (MRSF) on N loss and footprint of double-cropping rice fields in Hunan is still unclear.MethodsWe established a field experiment in which we applied various N compositions (N 135/148.5-90/99 kg ha-1) to early-season rice (ESR) and late-season rice (LSR). The loss of different N forms during the whole growth period of double cropping rice was measured. The N footprint of double cropping rice in the red soil region of Dongting Lake area was calculated using the life cycle assessment method.ResultsCompared with the conventional fertilizer, with a N level of 150/160 kg ha-1, the MRSF treatments significantly decreased both NH4+-N and NO3--N runoff by 26.2-40.9% and 9.0-36.5%, respectively, for ESR, and by 54.4-79.0% and 6.6-40.7%, respectively, for LSR. Moreover, relative to the conventional fertilization (CF) treatment, the MRSF treatments significantly reduced leaching loss by 21.8-41.2% and 20.5%-42.1%, respectively, for ESR, and 26.7-41.8% and 20.9%-51.0%, respectively, for LSR. While urease activity decreased with increasing soil depth, MRSF treatments increased relative soil urease activity in the later rice growth stages. Compared with the CF treatment, they also decreased the total N footprint by 42.3-53.5% and 45.1-57.1% for ESR and LSR, respectively. Correlation analysis further showed that mineral N loss and total N footprint increased exponentially with the N-application rate under the MRSF strategy.ConclusionsOverall, MRSF reduced environmental risks associated with N loss caused by paddy field leaching and runoff while maintaining the topsoil N content. In this manner, MRSF can attenuate the total N footprint of double-cropping rice systems in the Dongting Lake area.

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