| 上海郊区蔬菜田氮素流失的研 |
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| 作者姓名： | CAO Lin-Kui CHEN Guo-Jun LU Yi-Tong |
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| 作者单位： | School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 201101 （China） |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （No. 20337010）. |
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| 摘 要： | Nitrogen （N） leaching in vegetable fields from December 2002 to May 2003 with equal dressings of total N for a sequential rotation of Chinese flat cabbage （Brassica chinensis L. var. rosularis） and lettuce （Lactuca sativa L.） in a suburban major vegetable production base of Shanghai were examined using the lysimeter method to provide a scientific basis for rational utilization of nitrogen fertilizers so as to prevent nitrogen pollution of water resources. Results showed that leached N consisted mainly of nitrate N, which accounted for up to more than 90% of the total N loss and could contribute to groundwater pollution. Data also showed that by partly substituting chemical N （30%） in a basal dressing with equivalent N of refined organic fertilizer in the Chinese flat cabbage field, 64.5% of the leached nitrate N was reduced, while in the lettuce （Lactuca sativa L.） field, substituting 1/2 of the chemical N in a basal dressing and 1/3 of the chemical N in a top dressing with equivalent N of refined organic fertilizers reduced 46.6% of the leached nitrate N. In the twoyear sequential rotation system of Chinese flat cabbage and lettuce, nitrate-N leaching in the treatment with the highest amount of chemical fertilizer was up to 46.55 kg ha^-1, while treatment plots with the highest amount of organic fertilizer had only 17.58 kg ha^-1. Thus, partly substituting refined organic fertilizer for chemical nitrogen in the first two seasons has a great advantage of reducing nitrate-N leaching.
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| 关 键 词： | 上海 郊区 氮含量 有机质 植物 |
| 收稿时间： | 2005-03-29 |
| 修稿时间： | 2005-07-15 |
Nitrogen leaching in vegetable fields in the suburbs of Shanghai |
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| CAO Lin-Kui,CHEN Guo-Jun,LU Yi-Tong.Nitrogen leaching in vegetable fields in the suburbs of Shanghai[J].Pedosphere,2005,15(5):641-645. |
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| Authors: | CAO Lin-Kui CHEN Guo-Jun and LU Yi-Tong |
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| Institution: | School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 201101 (China). E-mail: clk@sjtu.edu.cn;School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 201101 (China). E-mail: clk@sjtu.edu.cn;School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 201101 (China). E-mail: clk@sjtu.edu.cn |
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| Abstract: | Nitrogen (N) leaching in vegetable fields from December 2002 to May 2003 with equal dressings of total N for a sequential rotation of Chinese flat cabbage (Brassica chinensis L. var. rosularis) and lettuce (Lactuca sativa L.) in a suburban major vegetable production base of Shanghai were examined using the lysimeter method to provide a scientific basis for rational utilization of nitrogen fertilizers so as to prevent nitrogen pollution of water resources. Results showed that leached N consisted mainly of nitrate N, which accounted for up to more than 90% of the total N loss and could contribute to groundwater pollution. Data also showed that by partly substituting chemical N (30%) in a basal dressing with equivalent N of refined organic fertilizer in the Chinese flat cabbage field, 64.5% of the leached nitrate N was reduced, while in the lettuce (Lactuca sativa L.) field, substituting 1/2 of the chemical N in a basal dressing and 1/3 of the chemical N in a top dressing with equivalent N of refined organic fertilizers reduced 46.6% of the leached nitrate N. In the two-year sequential rotation system of Chinese flat cabbage and lettuce, nitrate-N leaching in the treatment with the highest amount of chemical fertilizer was up to 46.55 kg ha-1, while treatment plots with the highest amount of organic fertilizer had only 17.58 kg ha-1. Thus, partly substituting refined organic fertilizer for chemical nitrogen in the first two seasons has a great advantage of reducing nitrate-N leaching. |
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| Keywords: | leaching loss nitrogen organic fertilizer vegetable field |
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