1. Overall speaking, the quality of the ground water in most of the cities and regions in the entire country is very good, with point and non-point pollution in certain regions to certain extent and certain indicators exceeding the standards. The key pollution indicators include mineralization degree, total hardness, nitrate, sub-nitrate, ammonia nitrogen, iron, manganese, chloride, sulfate, fluoride and pH value. 
   全国大部分城市和地区地下水水质总体较好，局部受到一定程度的点状或面状污染，部分指标超标，主要污染指标有矿化度、总硬度、硝酸盐、亚硝酸盐、氨氮、铁、锰、氯化物、硫酸盐、氟化物、ph值等。
2. Fertilizer consisting of sodium nitrate or potassium nitrate. 
   硝酯钯由硝酸钠或硝酸钾组成的化肥
3. nitrogen assimilation of plant 
   植物氮同化
4. pollution by nitrogen oxides 
   氮氧化物污染
5. treatment of nitrogen oxides 
   氮氧化物治理

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• 1. 叶柄硝态氮
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