Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8895522 | Pedosphere | 2017 | 6 Pages |
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 1 280 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 Mgâ1 grain as grain yield increased from 7 to 9 Mg haâ1, then decreased to 18.1, 16.9, and 15.9 kg N Mgâ1 grain as yield increased to 9-10, 10-11, and > 11 Mg haâ1, 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 Mgâ1 grain) than ordinary inbred and hybrid varieties (18.5 and 18.3 kg N Mgâ1 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 Mgâ1 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.
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Authors
Yi ZHANG, Xinping CHEN, Wenqi MA, Zhenling CUI,