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Characterizing N uptake and use efficiency in rice as influenced by environments

文献类型： 外文期刊

作者： Jiang, Peng 2 ; Xie, Xiaobing 1 ; Huang, Min 1 ; Zhou, Xuefeng 1 ; Zhang, Ruichun 1 ; Chen, Jiana 1 ; Wu, Dandan 1 ; Xia, 1 ;

作者机构： 1.Hunan Agr Univ, Collaborat Innovat Ctr Grain & Oil Crops Southern, Changsha, Hunan, Peoples R China

2.Sichuan Acad Agr Sci, Luzhou Branch Natl Rice Improvement Ctr, Key Lab Southwest Rice Biol & Genet Breeding, Rice &

关键词： N uptake;N use efficiency;physiological efficiency;grain yield

期刊名称：PLANT PRODUCTION SCIENCE （ 影响因子：2.222； 五年影响因子：2.175 ）

ISSN： 1343-943X

年卷期： 2016 年 19 卷 1 期

页码：

收录情况： SCI

摘要： To compare N uptake and use efficiency of rice among different environments and quantify the contributions of indigenous soil and applied N to N uptake and use efficiency, field experiments were conducted in five sites in five provinces of China in 2012 and 2013. Four cultivars were grown under three N treatments in each site. Average total N uptake was 10-12 g m(-2) in Huaiji, Binyang, and Haikou, 20 g m(-2) in Changsha, and 23 g m(-2) in Xingyi. Rice crops took up 54.6-61.7% of total plant N from soil in Huaiji, Binyang, and Haikou, 64.3% in Changsha, and 63.5% in Xingyi. Partial factor productivity of applied N and recovery efficiency of applied N in Changsha were higher than in Huaiji, Binyang, and Haikou, but were lower than in Xingyi. Physiological efficiency of soil N and fertilizer N were lower in Changsha than in Huaiji, Binyang, and Haikou, while the difference in them between Changsha and Xingyi were small or inconsistent. Average grain yields were 6.5-7.5 t ha(-1) (medium yield) in Huaiji, Binyang, and Haikou, 9.0 t ha(-1) (high yield) in Changsha, and 12.0 t ha(-1) (super high yield) in Xingyi. Our results suggest that both indigenous soil and applied N were key factors for improving rice yield from medium to high level, while a further improvement to super high yield indigenous soil N was more important than fertilizer N, and a simultaneous increasing grain yield and N use efficiency can be achieved using SPAD-based practice in rice production.

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