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Determining nitrogen topdressing rates in accordance with actual seedling density and crop nitrogen status in direct-seeded rice

文献类型： 外文期刊

作者： Peng, Bilin 1 ; Wang, Xinyu 1 ; Hu, Xiangyu 1 ; Liu, Yanzhuo 1 ; Liang, Kaiming 1 ; Fu, Youqiang 1 ; Hu, Rui 1 ; Li, Meijuan 1 ; Ye, Qunhuan 1 ; Yin, Yuanhong 1 ; Pan, Junfeng 1 ; Zhong, Xuhua 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Rice Res Inst, Minist Agr & Rural Affairs, Guangdong Key Lab New Technol Rice Breeding,Guangd, Guangzhou, Peoples R China

2.Guangdong Acad Agr Sci, Rice Res Inst, Guangdong Key Lab New Technol Rice Breeding, Guangdong Rice Engn Lab,Key Lab Genet & Breeding H, Guangzhou 510640, Peoples R China

关键词： direct-seeded rice; maximum tiller number; nitrogen management; plant nitrogen status; actual seedling density

期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE （ 影响因子：4.1； 五年影响因子：4.2 ）

ISSN： 0022-5142

年卷期： 2023 年

页码：

收录情况： SCI

摘要： BACKGROUND: Adjusting nitrogen (N) input based on actual seedling density (ASD) and plant N status is a practical approach for improving the yield stability of direct-seeded rice. However, the adjustment of topdressing N rates has been empirical in the past. This study aimed to establish a quantitative approach for determining N topdressing rates during tillering (N-til) and panicle development (N-PI) based on ASD and crop N status in direct-seeded rice. Field experiments were conducted involving 12 treatments, consisting of four N-til and three seeding rates in 2017, and eight treatments combining seeding rate, N-til, and N-PI in 2020. RESULTS: Linear regression analysis revealed that the tiller number at panicle initiation (TILPI) was predominantly influenced by ASD and N-til. The determination coefficients (R-2) of the regression models ranged from 0.887 to 0.936 across the four-season experiments. The results indicated that N-til could be determined accurately using ASD and the target maximum tiller number. Similarly, grain yield was influenced significantly by the N uptake at panicle initiation (NUPPI) and N-PI, with R-2 of 0.814 and 0.783 in the early and late seasons of 2020, respectively. This suggested that N-PI could be calculated based on NUPPI and the target grain yield. CONCLUSION: The findings offer a quantitative method for establishing N topdressing rates for tillering and panicle development, relying on the monitoring of actual seedling density and plant N status in direct-seeded rice production. (c) 2023 Society of Chemical Industry.

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