Nitrogen may cause non_point pollution in water in forms of eutrophication in surface waters and high nitrate concentration in ground water.
氮素流入对水域的污染为非点源污染，主要导致地表水的富营养化、地下水硝酸盐含量过高等。
Neither ammonium nitrogen nor nitrate nitrogen with high concentration in the medium helped to the growth of bacteria.
培养基中高浓度的氮不论是铵态氮还是硝态氮均不利于菌株的生长；
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