农业常用的氮肥有铵态、硝态和酰胺态三种类型。硝酸根和铵离子是作物根系从土壤中吸收氮的主要形式。硝态氮带负电荷,不能被带负电荷的土壤胶体吸附保存,故易随水渗漏或流失,在水浇地上使用时,其利用率较低。随着农业生产的发展,作物产量不断提高,对有效氮的需求量增加。与此同时氮肥的市场价格也在不断上涨,在不增加肥料的投资成本条件下,提高作物有效氮的吸收量值得 Nitrogen fertilizer commonly used in agriculture are ammonium, nitrate and amide state three types. Nitrate and ammonium ions are the major forms of crop roots that absorb nitrogen from soil. Nitrate is negatively charged and can not be adsorbed and preserved by negatively charged soil colloids. Therefore, it is easy to leak or drain with water. When it is used on irrigated land, its utilization rate is low. With the development of agricultural production, crop yields are continuously rising, and the demand for available nitrogen is increasing. At the same time, the market price of nitrogenous fertilizer is also on the rise. It is worthwhile to increase the amount of available nitrogen in crops without increasing the investment cost of fertilizers