Compound fertilizers are fertilizers made of chemical methods and/or blending methods with at least two nutrients in the indicated amounts of nitrogen, phosphorus and potassium; according to the process, they are divided into high tower compound fertilizers and ammoniated compound fertilizers. Spraying compound fertilizer, blending compound fertilizer and so on.

The drum granulation process is simple, but the granulation is smooth, if the quality of the raw materials is uneven, the effect is also different, the water solubility rate and utilization law are low, and it is easy to be lost, but it is better for the topdressing effect of crops with shorter growth periods in the dry period. The fertilizer effect of the granulation in the drum is fast.

Rotary drum spraying granulation has a hard granularity and a longer fertilizer efficiency than that of high tower granulation, and is not suitable for loss. It is easy to use as a crop base fertilizer with a long growth period. The disadvantage is that nitrogen is easily lost during compounding, so there is a secondary nitrogen addition process.

Ammonia granulation is pipe spraying granulation, the fertilizer effect period is between the drum and drum spraying, the utilization law is better than spraying, and lower than the high tower granulation, the water solubility is good, the particles are irregular, high The content of nitrogen and potassium can be adjusted freely, which is suitable for formula fertilization.

The granulation granules of the high tower are smooth, the hollow anti-counterfeiting, the content is balanced, the NPK can be freely adjusted, the fertilizer effect is the fastest in the compound fertilizer, easy to dissolve, and the most suitable for top dressing. The disadvantage is that the urine melts during the granulation spraying, if the process The time flow control is not good, it is easy to produce a large amount of biuret, and the moisture in the production is easily exceeded.