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Potential for high yield with increased seedling density and decreased N fertilizer application under seedling-throwing rice cultivation

文献类型： 外文期刊

作者： Liu, Yang 2 ; Li, Chao 4 ; Fang, Baohua 1 ; Fang, Yong 5 ; Chen, Kailin 1 ; Zhang, Yuzhu 3 ; Zhang, Haiqing 2 ;

作者机构： 1.Hunan Acad Agr Sci, Hunan Rice Res Inst, Changsha 410125, Hunan, Peoples R China

2.Hunan Agr Univ, Southern Reg Collaborat Innovat Ctr Grain & Oil C, Changsha 410128, Hunan, Peoples R China

3.Hunan Acad Agr Sci, Hunan Hybrid Rice Res Ctr, Changsha 410125, Hunan, Peoples R China

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

5.Hunan Acad Agr Sci, Inst Agr Biotechnol, Changsha 410125, Hunan, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2019 年 9 卷

页码：

收录情况： SCI

摘要： Fertilizer application for rice production has increased significantly in southern China to raise yields, but has led to problems with lodging, quality decline and environmental pollution. Therefore, research on fertilizer-saving cultivation technologies for high-yielding rice is necessary. A two-factor experiment was conducted to evaluate the effects of seedling-addition treatment (SAT) and nitrogen-saving treatment (NST) on yield formation and nitrogen absorption of individual plants and plant groups under the seedling-throwing cultivation system. Numbers of spikelets per panicle and filled grains per panicle of individual plants declined under decreased nitrogen application, but was compensated by substantially increased effective panicles number and total number of glumous flowers under SAT. Under the optimal SAT-NST treatments of 18% less N fertilizer and 32% additional seedlings, yield increased 1.79% and 4.29% compared with that of conventional practice (CK) in 2015 and 2016, respectively. The maturestage individual-plant biomass under SAT-NST treatments decreased by 27.46% and 20.49% compared with CK in 2015 and 2016, but plant-group biomass did not differ significantly (all > 16 t ha(-1)). Under SAT-NST treatments, effective number of panicles was positively correlated with maximum number of seedlings (r = 0.643) and N absorption amount in the tillering stage (r = 0.901).

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