尿素—甲醛缓效氮素肥料的制法本肥以尿素和甲醛水为基本原料，当其混合液通过反应产生白浊时，添加酸类固化剂，在加热下用捏合机脱水造粒制成。它是一种长期持续释放氮素的缓效氮素肥。配方：尿素：甲醛（３７％甲醛水）＝１∶１３６（重量比）；氢氧化钠添加量，以使... Urea - Formaldehyde slow-release nitrogen fertilizer method The fertilizer to urea and formaldehyde water as the basic raw materials, when the mixture generated by the reaction of white turbidity, adding acid curing agent, heated with a kneader dehydration granulation . It is a long-term sustained release of nitrogen fertilizer slow-acting nitrogen fertilizer. Formula: Urea: formaldehyde (37% formaldehyde water) = 1: 1.36 (by weight); sodium hydroxide added to make ...