Extrusion granulation is the most commonly used granulation method in fertilizer industry. It can produce high, medium and low content fertilizers. The fertilizer granules produced by extrusion granulation are cylindrical, and can be rounded and shaped to round granules. The selected raw materials are generally low water content, poor viscosity materials, commonly used raw materials are: excrement, furfural residue, humic acid, cassava residue, mushroom residue and other powder viscosity poor organic materials. Bio organic fertilizer can be produced before and after adding microbial inoculants.

The process flow ：