Optimum nitrogen use and reduced nitrogen loss for production of rice and wheat in the Yangtse Delta region
文献类型：期刊论文
| 作者 | Wang, DJ; Liu, Q; Lin, JH; Sun, RJ |
| 刊名 | ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
 |
| 出版日期 | 2004-06-01 |
| 卷号 | 26期号:2-3页码:221-227 |
| 关键词 | NO3--N leaching optimum nitrogen rate rice-wheat system Yangtse Delta region yield |
| ISSN号 | 0269-4042 |
| 通讯作者 | Wang, DJ(djwang@issas.ac.cn) |
| 英文摘要 | A long-term field and lysimeter experiment under different amount of fertilizer-N application was conducted to explore the optimal N application rates for a high productive rice-wheat system and less N leaching loss in the Yangtse Delta region. In this region excessive applications of N fertilizer for the rice wheat production has resulted in reduced N recovery rates and environment pollution. Initial results of the field experiments showed that the optimal N application rate increased with the yield. On the two major paddy soils (Hydromorphic paddy soil and Gleyed paddy soil) of the region, the optimal N application rate was 225-270 kg N hm(-2) for rice and 180-225 kg N hm(-2) for wheat, separately. This has resulted in the highest number of effective ears and Spikelets per unit area, and hence high yield. Nitrogen leaching in the form of NO3--N occurs mainly in the wheat-growing season and in the ponding and seedling periods of the paddy field. Its concentration in the leachate increased with the N application rate in the lysimeter experiment. When the application rate reached 225 kg N hm(-2), the concentration rose to 5.4-21.3 mgN l(-1) in the leachate during the wheat-growing season. About 60% of the leachate samples determined contained NO3--N beyond the criterion (NO3--N 10 mg l(-1)) for N pollution. In the field experiment, when the N application rate was in the range of 270-315 kg hm(-2), the NO3--N concentration in the leachate during the wheat-growing season ranged from 1.9 to 11.0 mg l(-1). About 20% of the leachate samples reached close to, and 10% exceeded, the criterion for N pollution. Long-term accumulation of NO3--N from leaching will no doubt constitute a potential risk of N contamination of the groundwater in the Yangtse Delta Region. |
| 收录类别 | SCI |
| WOS研究方向 | Engineering ; Environmental Sciences & Ecology ; Public, Environmental & Occupational Health ; Water Resources |
| WOS类目 | Engineering, Environmental ; Environmental Sciences ; Public, Environmental & Occupational Health ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000223553200014 |
| 出版者 | KLUWER ACADEMIC PUBL |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2559346 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Wang, DJ |
| 作者单位 | Chinese Acad Sci, Inst Soil Sci, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, DJ,Liu, Q,Lin, JH,et al. Optimum nitrogen use and reduced nitrogen loss for production of rice and wheat in the Yangtse Delta region[J]. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH,2004,26(2-3):221-227. |
| APA | Wang, DJ,Liu, Q,Lin, JH,&Sun, RJ.(2004).Optimum nitrogen use and reduced nitrogen loss for production of rice and wheat in the Yangtse Delta region.ENVIRONMENTAL GEOCHEMISTRY AND HEALTH,26(2-3),221-227. |
| MLA | Wang, DJ,et al."Optimum nitrogen use and reduced nitrogen loss for production of rice and wheat in the Yangtse Delta region".ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 26.2-3(2004):221-227. |
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来源：南京土壤研究所
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