Nitrate content in ground water accumulates obviously with the increase of N-fertilizer applied, so the potential pollution should not be ignored.

随着施N时间的推移和施用量的增加，地下水中硝态氮具有明显的积累趋势，潜在污染不容忽视；

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Two-dimension groundwater quantity and quality model in the vertical profile is made to carry out the simulation and analysis of nitrate-N pollution of the groundwater in the typical profile.

所建立的地下水垂向剖面的二维水量水质模型，对典型剖面中地下水的硝态氮污染进行了模拟和分析。

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The results indicate that the nitrate-N leakage loss under the root zone caused by fertilizer irrigation could creat the pollution of shallow groundwater in Tangshan agricultural area.

计算结果表明，唐山农业区灌溉施肥引起根区以下硝态氮渗漏损失可造成浅层地下水的污染。

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"We're talking about one invisible way of dying early -- by cancer, in Chernobyl -- versus another way: fine particulate air pollution, " said Frank N. von Hippel, a nuclear physicist and Princeton University professor.

CNN: Why does 'nuclear' scare us so much?

Shiva Vencat, chief executive of Zero Pollution Motors in New Paltz, N.

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