| 氮肥施用量对土壤硝态氮含量和分布的影响 |
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| 引用本文： | 张国印,孙世友,王丽英,王志军,赵同科.氮肥施用量对土壤硝态氮含量和分布的影响[J].河北农业科学,2003,7(4):7-12. |
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| 作者姓名： | 张国印 孙世友 王丽英 王志军 赵同科 |
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| 作者单位： | 河北省农林科学院农业资源环境研究所,石家庄,050051 |
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| 基金项目： | 河北省科技攻关项目(01220307D)，河北省自然科学基金(302444) |
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| 摘 要： | 采用长期定位试验，研究了冬小麦-夏玉米一年两熟轮作下的施氮量与NO3^- -N在土壤中的淋移关系，提出了该区单季作物的适宜施氮量。结果表明，增加施N量可明显增加土壤NO3^- -N含量；随着施N量增加和施用年限延长，土壤NO3^- -N积累层显著向土壤剖面深层移动；当施N量持续达到或者超过300kg／hm^2时，对地下水的威胁增大；本研究地区的单季施N量宜控制在225kg／hm^2以下。
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| 关 键 词： | 氮肥 施用量 土壤 硝态氮 含量 区域分布 影响因素 |
Effects of Nitrogen Fertilizer on NO-3-N Content and Distribution in the Soil |
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| Zhang Guoyin,Sun Shiyou,Wang Liying,Wang Zhijun,Zhao Tongke.Effects of Nitrogen Fertilizer on NO-3-N Content and Distribution in the Soil[J].Journal of Hebei Agricultural Sciences,2003,7(4):7-12. |
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| Authors: | Zhang Guoyin Sun Shiyou Wang Liying Wang Zhijun Zhao Tongke |
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| Abstract: | A long-term experiment was carried out to investigate the effects of nitrogen fertilizer on the NO3-- N content and distribution in the soil. Six nitrogen application rates of 0, 75, 150, 225, 300 and 375 kg/hm2 were used. The results showed that crop yields increased with N application rate but nitrogen utilization efficiency decreased at the same time. In addition, soil NO3--N content increased with N rates. There were significant downward movements of NO3-- N in the soil profile, especially when the N rate was over 225 kg/hm2. When the N rate was above 300 kg/ hm2, the risk for groundwater pollution was substantially increased. This suggests the N rate for a single crop should not exceed 225 kg/hm2 in this region. |
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