Reducing N losses through surface runoff from rice-wheat rotation by improving fertilizer management

文献类型： 外文期刊

第一作者： Cao, Yansheng

作者： Cao, Yansheng;Sun, Huifeng;Liu, Yaqin;Fu, Zishi;Chen, Guifa;Zou, Guoyan;Zhou, Sheng

作者机构：

关键词： Surface runoff;Nitrogen loss;Rice-wheat rotation;Improved fertilizer management

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

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收录情况： SCI

摘要： To better understand N runoff losses from ricewheat rotation and demonstrate the effectiveness of improved fertilizer management in reducing N runoff losses, a field study was conducted for three consecutive rice-wheat rotations. Nitrogen losses through surface runoff were measured for five treatments, including CK without N application, C200, C300 simulating the conventional practices, CO200, and CO300. Optimum N rate was applied for C200 and CO200, and 30% of chemical fertilizer was substituted with organic fertilizer for CO200 and CO300 with respect to C200 and C300, respectively. Rice season had higher runoff coefficients than wheat season. Approximately 52% of total N was lost as NH4+-N in rice season, ranging from 21 to 83%, and in wheat season, the proportion of NO3--N in total N averaged 53% with a variation from 38 to 67%. The N treatments lost less total N in rice season (1.67-10.7 kg N ha-1) than inwheat season (1.72-17.1 kg N ha(-1)). These suggested that a key to controlling N runoff losses from rice-wheat rotation was to limit NO3--N accumulation in wheat season. In both seasons, N runoff losses for C200 and CO300 were lower than those for C300. CO200 better cut N losses than C200 and CO300, with 64 and 57% less N in rice and wheat seasons than C300, respectively. Compared with the conventional practices, optimum N inputs integrated with co-application of organic and chemical fertilizers could reduce N runoff losses with a better N balance under rice-wheat rotation.

分类号： X5`X

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