Pedosphere 27(2): 358--363, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Elucidating variations in nitrogen requirement according to yield, variety and cropping system for Chinese rice production
ZHANG Yi1,2, CHEN Xinping1, MA Wenqi3,CUI Zhenling1
1Centre for Resources, Environment and Food Security, China Agricultural University, Beijing 100193 (China)
2 College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128 (China)
3 College of Resources and Environmental Science, Hebei Agricultural University, Baoding 071001 (China)
      Better understanding of the factors that influence crop nitrogen (N) requirement plays an important role in improving regional N recommendations for rice ( Oryza sativa L.) production. We collected data from 1280 plot-level measurements in different reaches of the Yangtze River, China to determine which factors contributed to variability in N requirement in rice. Yield, variety, and cropping system were significantly related to N requirement.The N requirement remained consistent at about 18.6 kg N Mg-1 grain as grain yield increased from 7 to 9 Mg ha-1, then decreased to 18.1, 16.9, and 15.9 kg N Mg-1 grain as yield increased to 9--10, 10--11, and > 11 Mg ha-1, respectively. The decreased requirement for N with increasing yield was attributable to declining N concentrations in grain and straw and increased harvest index.Super rice variety had lower N requirement (17.7 kg N Mg-1 grain) than ordinary inbred and hybrid varieties (18.5 and 18.3 kg N Mg-1 grain, respectively), which was a result of lower grain and straw N concentrations of super rice.The N requirements were 19.2, 17.8, and 17.5 kg N Mg-1 grain for early, middle, and late rice cropping systems, respectively. In conclusion, the rice N requirement was affected by multiple factors, including yield, variety, and cropping system, all of which should be considered when planning for optimal N management.
Key Words:  grain and straw N concentrations, grain yield, harvest index, N management, plant N uptake, reciprocal internal efficiency
Citation: Zhang, Y., Chen, X., Ma, W. and Cui, Z. 2017. Elucidating variations in nitrogen requirement according to yield, variety and cropping system for Chinese rice production. Pedosphere. 27(2): 358-363.
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