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2环保型专用叶面肥配方设计研究2.1环保型专用肥配方设计根据无公害蔬菜的要求,蔬菜中亚硝酸盐、硝酸盐含量必须降低到一定范围,因此,在所用肥料的氮肥形态比例合适,就能达到满足作物营养的同时,降低蔬菜中亚硝酸盐、硝酸盐含量的要求。氮肥按其所含的氮素形态可分为铵态氮、硝态氮、酰胺态氮。铵态氮施入土壤后,NH4+易被土壤胶体吸附,不易流失;硝态氮施入土壤后,不能被土壤胶体吸附,移动性大,易随水流失;酰胺态氮肥其氮以酰胺基形态(-CONH2)存在,这类肥料主要有尿素,它的扩散性很强,小部分能以分子态被植物吸收,大部分需经转化成铵态氮后才能吸收,肥效比NH4+-N和NO3--N肥迟缓。
2 environmental-friendly design of the formula for foliar fertilizer 2.1 environmental formula designed for fertilizer According to the requirements of pollution-free vegetables, vegetables, nitrite, nitrate content must be reduced to a certain range, therefore, the proportion of nitrogen fertilizer used in the right mode, Can meet the crop nutrition at the same time, reduce the nitrite in vegetables, nitrate content requirements. Nitrogen nitrogen can be divided according to its form can be divided into ammonium nitrogen, nitrate nitrogen, amide nitrogen. When ammonium nitrogen is applied to soil, NH4 + is easily adsorbed by soil colloids and is not easily lost. When nitrate nitrogen is applied to soil, it can not be adsorbed by soil colloids and has large mobility and easy loss with water. (-CONH2), these fertilizers are mainly urea, its diffusivity is strong, a small part of molecular state can be absorbed by plants, most of them need to be transformed into ammonium nitrogen after absorption, fertilizer efficiency than NH4 + -N and NO3 - N slow fat.