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) |
| Corresponding Author:cuizl@cau.edu.cn. |
| ABSTRACT |
| 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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