Nitricnitrogen in greenery vegetable exceed level I standard, pollution index is up to 3.50;
叶菜类中硝酸盐含量均超过一级标准，污染指数高达3.50，污染最重；
2
The excessively high proportion ammonium nitrogen does not avail the enhancement of tobacco leaf mean price, it is highest if matched by 75% nitricnitrogen and 25% ammonium nitrogen;
过高的比例施用铵态氮不利于烤烟均价的提高，以75％的硝态氮和25％铵态氮配施烤烟均价最高；
3
Water vapor in the air combines with nitrogen and forms nitric acid.