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硫銨、碳酸氢銨、氯化銨等氮素肥料,施入土壤中,由于土壤微生物的活动,銨态氮会迅速变成硝态氮,硝态氮易被淋溶而損失。因此肥料工业专家和农业化学家們长期以来卽致力于获得水溶性低的,能在长时期內逐漸释放的氮素肥料。尿醛肥料是尿素和醛类化合物形成的聚合物,例如尿素甲醛肥料在土壤中溶解性低、分解慢、不易淋溶,在大量施用尿素甲醛肥料时,也不致烧伤作物。尿素甲醛肥料在土壤中的硝化作用强度直接与尿素甲醛分子比例有关;尿素甲醛分子比例为0.88和1.03时,硝化作用强度很小,随着尿素甲醛分子比例的加大,土壤硝化强度也增大。
Ammonium sulfate, ammonium bicarbonate, ammonium chloride and other nitrogen fertilizers applied to the soil, due to the activity of soil microorganisms, ammonium nitrogen will quickly become nitrate nitrogen, nitrate nitrogen easily leached and lost. As a result, fertilizers and agrochemicals have long been committed to obtaining low water-soluble nitrogen fertilizers that can be gradually released over a long period of time. Urea fertilizers are polymers of urea and aldehyde compounds. For example, urea formaldehyde fertilizers have low solubility in soil, slow decomposition, and are not easily leached. When urea formaldehyde fertilizer is used in large quantities, they will not cause burns. The strength of nitrification of urea-formaldehyde fertilizer in the soil is directly related to the ratio of urea formaldehyde molecules. When the ratio of urea formaldehyde molecules is 0.88 and 1.03, the nitrification intensity is very small. As the proportion of urea formaldehyde molecules increases, the nitrification intensity of soil increases .