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Low N apparent surplus with higher rice yield under long-term fertilizer postponing in the rice-wheat cropping system

文献类型： 外文期刊

作者： Zhou, Yan 1 ; Xu, Lei 1 ; Zhang, Jianwei 1 ; Li, Weiwei 1 ; Jiang, Yu 1 ; Wang, Songhan 1 ; Ding, Yanfeng 1 ; Liu, Zhenghui 1 ; Li, Ganghua 1 ;

作者机构： 1.Nanjing Agr Univ, Natl Engn & Technol Ctr Informat Agr, Jiangsu Collaborat Innovat Ctr Modern Crop Prod, Key Lab Crop Physiol & Ecol Southern China, Nanjing 210095, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, China Inst Agr Resources & Environm, Sci Observing & Expt Stn Arable Land, Minist Agr & Rural Affairs, Nanjing 210095, Jiangsu, Peoples R China

关键词： Fertilizer postponing; N apparent surplus; Rice yield; Spikelets per panicle; Rice-wheat cropping systems

期刊名称：CROP JOURNAL （ 影响因子：4.647； 五年影响因子：5.781 ）

ISSN： 2095-5421

年卷期： 2022 年 10 卷 4 期

页码：

收录情况： SCI

摘要： Nitrogen (N) fertilization increases rice yield, but inappropriate N fertilizer application increases N loss and the risk of environmental pollution. Short-term fertilizer postponing (FP) generally reduces N apparent surplus and increases rice yields, but the effects of long-term FP on N surplus and rice yields remain unknown. Our study was the first to investigate the impacts of long-term FP (11 years) on N apparent surplus and rice yields. FP effects in the short term (& LE;6 years) did not affect rice yields, whereas FP effects in the long term (> 6 years) increased rice yields by 13.9% compared with conventional fertilization (CF). FP did not affect panicles per unit area, 1000-kernel weight, and filled-kernel rate, but spikelets per panicle increased over time due to spikelet formation stimulation. FP also reduced the N apparent surplus over time more strongly than CF owing to higher N accumulation and N utilization efficiency. FP effects in the long term also significantly increased soil organic matter, total N, and NH4+-N content. Our results were supported by a pot experiment, showing that rice yields in soils with a history of FP were significantly higher than those for soils without a history of FP, indicating that FP increased rice yields more strongly in later years mainly because of soil quality improvement. Our findings suggest that long-term FP can reduce N loss while increasing rice yields by improving soil quality. (C) 2022 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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