Recovery and Leaching of N-15-Labeled Coated Urea in a Lysimeter System in the North China Plain

文献类型： 外文期刊

第一作者： Li Gui-Hua

作者： Li Gui-Hua;Zhao Lin-Ping;Zhang Shu-Xiang;Zhang Shu-Xiang;Hosen, Y.;Yagi, K.

作者机构：

关键词： N-15 fertilizer;nitrogen use efficiency;polyolefin-coated urea;residual N;wheat-maize rotation system

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

ISSN： 1002-0160

年卷期： 2011 年 21 卷 6 期

页码：

收录情况： SCI

摘要： The effectiveness of polyolefin-coated urea (Meister-5 and Meister-10; CU) in a wheat (Triticum aestivum L.)-maize (Zea mays L.) rotation system was studied in lysimeter plots located in the North China Plain for three consecutive maize-wheat-maize cropping seasons. An isotopic method was used to compare the fate of CU to that of non-coated urea (NCU), and N application rates of 0, 100, 150 and 225 kg N ha(-1) were evaluated. The results showed that the nitrogen use efficiency ((NUE)-N-15) of CU was 13.3%-21.4% greater than that of NCU for the first crop. Alternatively, when the difference method was applied (apparent NUE), no significant variations were observed among treatments in all three seasons. Although inorganic N leached from the 1.3 m layer was less than 1% of the total applied N, unidentified losses of N-15 (losses of N-15 = N-15. applied as fertilizer - N-15 absorbed by crops - N-15 remaining in the 0-0.2 m layer - N-15 leached from the 1.3 m layer) in CU-treated plots were 24.2%-26.5% lower than those of NCU-treated plots. The nitrate concentration in the 0-1.3 m layer of CU plots at the end of the experiment was 53% lower than that of NCU-treated plots. Thus, CU increased crop N uptake from fertilizer and reduced unidentified losses of applied N, which can reduce the risk of groundwater pollution.

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