Soil nitrate accumulation, leaching and crop nitrogen use as influenced by fertilization and irrigation in an intensive wheat-maize double cropping system in the North China Plain
文献类型：SCI/SSCI论文
| 作者 | Yu Q.; Wang J.; Wang J. |
| 发表日期 | 2006 |
| 关键词 | nitrate-N accumulation and leaching wheat-maize double cropping system crop nitrogen use ground water North China Plain use efficiency environment management |
| 英文摘要 | There is a growing concern about excessive nitrogen (N) and water use in agricultural systems in North China due to the reduced resource use efficiency and increased groundwater pollution. A two-year experiment with two soil moisture by four N treatments was conducted to investigate the effects of N application rates and soil moisture on soil N dynamics, crop yield, N uptake and use efficiency in an intensive wheat-maize double cropping system (wheat-maize rotation) in the North China Plain. Under the experimental conditions, crop yield of both wheat and maize did not increase significantly at N rates above 200 kg N ha(-1). Nitrogen application rates affected little on ammonium-N (NH4-N) content in the 0-100 cm soil profiles. Excess nitrate-N (NO3-N), ranging from 221 kg N ha(-1) to 620 kg N ha(-1), accumulated in the 0-100 cm soil profile at the end of second rotation in the treatments with N rates of 200 kg N ha(-1) and 300 kg N ha(-1). In general, maize crop has higher N use efficiency than wheat crop. Higher NO3-N leaching occurred in maize season than in wheat season due to more water leakage caused by the concentrated summer rainfall. The results of this study indicate that the optimum N rate may be much lower than that used in many areas in the North China Plain given the high level of N already in the soil, and there is great potential for reducing N inputs to increase N use efficiency and to mitigate N leaching into the groundwater. Avoiding excess water leakage through controlled irrigation and matching N application to crop N demand is the key to reduce NO3-N leaching and maintain crop yield. Such management requires knowledge of crop water and N demand and soil N dynamics as they change with variable climate temporally and spatially. Simulation modeling can capture those interactions and is considered as a powerful tool to assist in the future optimization of N and irrigation managements. |
| 出处 | Plant and Soil |
| 卷 | 284 |
| 期 | 1-2 |
| 页 | 335-350 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0032-079X |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/24045]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Yu Q.,Wang J.,Wang J.. Soil nitrate accumulation, leaching and crop nitrogen use as influenced by fertilization and irrigation in an intensive wheat-maize double cropping system in the North China Plain. 2006. |
入库方式： OAI收割
来源：地理科学与资源研究所
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