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《Chinese Journal of Soil Science》 2009-03
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Effects of SRI on Rice Yield,Water Productivity and NH_3 Volatilization from Soil with Different N Application Rates

ZHAO Li-mei1,2, WU Liang-huan1, WU Mei-yan1 ( 1.College of Environmental and Resource Sciences, Zhejiang University, Hnagzhou 310029,China;2. College of Ecology and Environment, Inner Mongolia Agricultural University, Huhhot 010019, China.)  
Field experiments were conducted in 2006 to investigate effects of SRI on rice yield, water productivity and NH3 volatilization from soil with different N application rates. Grain yield under SRI was higher than traditional flooding, regardless of amount of N fertilizer application. Average grain yield was increased by 24.1% with reducing irrigation water 830.3 mm, and SRI increased the water productivity. The greatest NH3 volatilization loss took place when urea applied at the basal stage, the intermediate loss at the tillering stage, and the smallest at the booting stage. Average NH3 loss by volatilization accounted for 5.7% under SRI and 4.9% under TF, respectively, and total amount of NH3 loss increased by 25.2% with SRI.
【Key Words】: System of rice intensification (SRI) Water use efficiency Ammonia volatilization Nitrogen fertilizer
【Fund】: 国家自然科学基金(39970146 30571082);; 农业部农业结构调整重大技术研究专项(2003-01-02A)资助
【CateGory Index】: S511
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