Urea-formaldehyde controlled-release fertilizer is a kind of urea-formaldehyde controlled-release fertilizer, which is made up of the polymer (formaldehyde resin) and nitrogen, phosphorus and potassium according to the ratio of urea and formaldehyde. The fertilizer has good fertilizer efficiency, high particle strength, non-fragmentation, round and glossy particles, no caking, no dust, pressure, easy to store and transport, and is conducive to mechanical fertilization.

The process flow：