文献类型： 外文期刊

第一作者： Fu You-qiang

作者： Fu You-qiang;Zhong Xu-hua;Liang Kai-ming;Pan Jun-feng;Liu Yan-zhuo;Hu Xiang-yu;Peng Bi-lin;Chen Rong-bing;Hu Rui;Huang Nong-rong;Zeng Jia-huan;Xin Ying-feng

作者机构：

关键词： grain yield; resource use efficiencies; indica rice; planting density; nitrogen application strategy

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2021 年 20 卷 2 期

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收录情况： SCI

摘要： Improving both grain yield and resource use efficiencies simultaneously is a major challenge in rice production. However, few studies have focused on integrating dense planting with delayed and reduced nitrogen application to enhance grain yield, nitrogen use efficiency (NUE) and radiation use efficiency (RUE) in rice (Oryza sativa L.) in the double rice cropping system in South China. A high-yielding indica hybrid rice cultivar (Yliangyou 143) was grown in field experiments in Guangxi, South China, with three cultivation managements: farmers' practice (FP), dense planting with equal N input and delayed N application (DPEN) and dense planting with reduced N input and delayed N application (DPRN). The grain yields of DPRN reached 10.6 and 9.78 t ha(-1) in the early and late cropping seasons, respectively, which were significantly higher than the corresponding yields of FP by 23.9-29.9%. The grain yields in DPEN and DPRN were comparable. NUE in DPRN reached 65.2-72.9 kg kg(-1), which was 61.2-74.1% higher than that in FP and 24.6-30.2% higher than that in DPEN. RUE in DPRN achieved 1.60-1.80 g MJ(-1), which was 28.6-37.9% higher than that in FP. The productive tiller percentage in DPRN was 7.9-36.2% higher than that in DPEN. Increases in crop growth rate, leaf area duration, N uptake from panicle initiation to heading and enhancement of the apparent transformation ratio of dry weight from stems and leaf sheaths to panicles all contributed to higher grain yield and higher resource use efficiencies in DPRN. Correlation analysis revealed that the agronomic and physiological traits mentioned above were significantly and positively correlated with grain yield. Comparison trials carried out in Guangdong in 2018 and 2019 also showed that DPRN performed better than DPEN. We conclude that DPRN is a feasible approach for simultaneously increasing grain yield, NUE and RUE in the double rice cropping system in South China.

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