| 氮肥施用量对大白菜硝酸盐累积的影响研究 |
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| 引用本文： | 高艳明,孙 权,李建设.氮肥施用量对大白菜硝酸盐累积的影响研究[J].中国生态农业学报,2004,12(2):115-117. |
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| 作者姓名： | 高艳明 孙 权 李建设 |
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| 作者单位： | 宁夏大学农学院,银川,750021 |
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| 基金项目： | 宁夏回族自治区教育厅资助 |
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| 摘 要： | 田间试验研究不同施N量对灌淤土农田大白菜产量及白菜和土壤硝酸盐累积的影响结果表明 ,宁夏灌区复种大白菜产量随施N量的增加而增加 ,且净菜率提高 ,复种大白菜最佳产量施N量为 4 2 7 5kg/hm2 ;大白菜硝酸盐含量外叶高于内叶 ,内叶硝酸盐含量基本随施N量的增加而增加 ,低N时外叶硝酸盐含量维持一定水平 ,高N时总体随生育期延长而增加 ;施用N肥明显增加土体中NO-3 N残留量 ,高施N量传统种植非但不能获得高产 ,净菜率低 ,成熟期推迟 ,且造成土壤剖面尤其是耕层NO-3 N大量累积 ,N素利用效率低。
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| 关 键 词： | 灌淤土 大白菜 N肥施用量 硝酸盐 |
| 收稿时间： | 4/9/2003 12:00:00 AM |
| 修稿时间： | 2003年4月9日 |
Effects of different applying amounts of N fertilizer on the accumulated content of nitrate in the Chinese cabbage |
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| GAO
Yan-Ming,SUN Quan and LI Jian-She.Effects of different applying amounts of N fertilizer on the accumulated content of nitrate in the Chinese cabbage[J].Chinese Journal of Eco-Agriculture,2004,12(2):115-117. |
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| Authors: | GAO
Yan-Ming SUN Quan and LI Jian-She |
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| Abstract: | The effects of different applying amounts of N fertilizer on the yield of Chinese cabbage and the content of accumulated nitrate in the cabbage and soil are studied in this paper. The results show that the cabbage yield and the net yield rate are increased with the increase of the application of N fertilizer. The rational applying amount of N fertilizer to the cabbage is 427.5kg/hm2. The content of nitrate is higher in outside leaves than in inner ones and it is increased with the increase of N fertilizer application. The outside leaves contain a certain amount of nitrate in low N application, but the nitrate content increases with the growth of the cabbage when the N fertilizer application is high. The nitrate kept in soils is increased when N fertilizer is applied. Applying higher amount of N fertilizer in a traditional cultivating practice, the low yield and net yield will be got, the ripe season is delayed, and a quite amount of nitrate is accumulated in soil profile. Therefore, the fertilizer use efficiency is low. |
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| Keywords: | Guanyu Soil Chinese cabbage Applying amount of N fertilizer Nitrate |
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