The effects of different nitrogen fertilizers on salt content and ion composition in greenhouse and open field soil were studied through laboratory incubation experiment.
通过室内模拟培养实验，研究了尿素、碳酸氢铵和硝酸钙对设施土壤盐分含量和离子组成的影响。
Under a certain water and nitrate treatments, soil nitrate in open-land vegetable field would move down below 180cm soil.
一定水氮供应条件下，露地生产蔬菜地土壤硝态氮有可能淋洗到1.8米土体以下。
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