Sulfur Controlled-release Fertilizer is a process of coating sulfur solution, heating urea, granular (compound fertilizer) and other materials in the coating equipment with film wrapping and paraffin sealing treatment. The thickness of the wrapping layer can be controlled according to the release time. The wrapped fertilizer does not need late fertilization, so as to avoid waste of artificial and fertilizer by late topdressing. The loss of efficiency. Sulfur controlled-release fertilizers are mostly yellow, with smooth particles and difficult to caking. It can be used alone or as a raw material for mixing BB fertilizer.

The process flow：