文献类型： 外文期刊

作者： Li Ganghua ¹ ; Lin Jingjing ¹ ; Xue Lihong ² ; Ding Yanfeng ¹ ; Wang Shaohua ¹ ; Yang Linzhang ² ;

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

2.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Jiangsu, Peoples R China

3.Yancheng Biol Engn Higher Vocat Technol Sch, Yancheng 224051, Peoples R China

关键词： N balance; N loss; N split ratio; N use efficiency; plant uptake; rice variety; soil residual N; yield

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

ISSN： 1002-0160

年卷期： 2018 年 28 卷 1 期

页码：

收录情况： SCI

摘要： Split fertilization strategy is popularly adopted in rice to synchronize soil nitrogen (N) supply and crop N demand. Attention has been paid more on mid-season topdressing N, but limited on basal N. A clearer understanding of the basal N fate under split fertilization is crucial for determining rational basal N split ratio to improve the yield and reduce the loss to environment. A two-year field experiment with two N rates of 150 and 300 kg N ha(-1), two split ratios of basal N, 40% and 25%, and two rice varieties, Wuyunjing 23 (japonica) and Y-liangyou 2 (super hybrid indica), was conducted. Labelled 1 5 N urea was supplied in micro-plots as basal fertilizer to determine the plant uptake, translocation, soil residual, and loss of basal N fertilizer. The results showed that basal N absorbed by rice was only 1.6%-11.5% before tillering fertilization (8-10 d after transplanting), 6.5%-21.4% from tillering fertilization to panicle fertilization, and little (0.1%-4.4%) after panicle fertilization. The recovery efficiency of basal N for the entire rice growth stage was low and ranged from 18.7% to 24.8%, not significantly affected by cultivars or N treatments. Soil residual basal N accounted for 10.3%-36.4% and decreased with increasing total N rate and basal N ratio, regardless of variety and year. 43.8%-70.4% of basal N was lost into the environment based on the N balance. Basal N loss was significantly linearly positive related with the basal N rate and obviously enhanced by the increasing basal N ratio for both varieties in both 2012 and 2013. The N use efficiency and yield was significantly improved when decreasing the basal N ratio from 40% to 25%. The results indicated that the basal N ratio should be reduced, especially with limited N inputs, to improve the yield and reduce the N loss to the environment.