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How to use the roll compactor to maker NPK fertilizer granular/pellet

What is NPK fertilizer

The NPK compound fertilizer refers to a fertilizer variety that contains more than two elements in the three nutrient elements of nitrogen (N), phosphorus (P), and potassium (K) required by crops, or contains a variety of nutrient elements including medium or trace elements, and is mechanically mixed and manufactured. Products made from granulation, drying, screening, etc. According to its physical state, it can be divided into solid compound fertilizer and liquid compound fertilizer. Solid compound fertilizer is divided into powder, granulation (from dry granulation) and bulk blended compound fertilizer.
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