Polyolefin-Coated Urea Decreases Ammonia Volatilization in a Double Rice System of Southern China

文献类型： 外文期刊

第一作者： Xu, Minggang

作者： Xu, Minggang;Li, Dongchu;Li, Jumei;Qin, Daozhu;Shen, Huaping;Cong, Rihuan;He, Xinhua;Hosen, Yasukazu;He, Xinhua;He, Xinhua

作者机构：

期刊名称：AGRONOMY JOURNAL （ 影响因子：2.24； 五年影响因子：2.829 ）

ISSN： 0002-1962

年卷期： 2013 年 105 卷 1 期

页码：

收录情况： SCI

摘要： Field evaluations of slow-release N fertilizers are needed to improve N use efficiency while reducing NH3 volatilization. Ammonia volatilization losses, floodwater NH4+, and aboveground rice (Oryza sativa L.) tissue N accumulation were compared between non-coated urea (NCU) and polyolefin-coated urea (POCU) applications in a double-rice production system of subtropical China. A factorial treatment design included two urea sources such as POCU and NCU applied at 75 and 150 kg N ha(-1), and a no-N control. For early and late rice seasons, floodwater NH4+ and pH increased significantly within 7 to 10 d after NCU applications and then decreased rapidly. Nitrogen losses through NH3 volatilization accounted for 16 to 30% and 4 to 8% of the total N applied for NCU and POCU, respectively. Applications of POCU significantly increased N accumulation in aboveground rice biomass due to a slower N release and better synchrony between in-season rice N demand and N supply from this fertilizer. Applications of POCU at a rate of 75 kg N ha(-1) provided the optimal amounts of N for early and late rice crops and reduced NH3 volatilization losses. The use of slow release urea fertilizers should increase N use efficiency and maintain the high grain yield in the double rice production systems of subtropical China.

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