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

引用

The Crop Journal 2022年第4期10卷 1178-1186页

作者： Yan Zhou Lei Xu Jianwei Zhang Weiwei Li Yu Jiang Songhan Wang Yanfeng Ding Zhenghui Liu Ganghua Li National Engineering and Technology Center for Information Agriculture/Key Laboratory of Crop Physiology and Ecology in Southern China/Jiangsu Collaborative Innovation Center for Modern Crop Production Nanjing Agricultural UniversityNanjing 210095JiangsuChina Scientific Observing and Experimental Station of Arable Land Ministry of Agriculture and Rural AffairsChina/Institute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210095JiangsuChina

Nitrogen(N)fertilization increases rice yield,but inappropriate N fertilizer application increases N loss and the risk of environmental ***-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 *** study was the first to investigate the impacts of long-term FP(11 years)on N apparent surplus and rice *** effects in the short term(≤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 *** also reduced the N apparent surplus over time more strongly than CF owing to higher N accumulation and N utilization *** effects in the long term also significantly increased soil organic matter,total N,and NH4_(+)^(-)N *** 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 *** findings suggest that longterm FP can reduce N loss while increasing rice yields by improving soil quality.

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

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