NPK blending machine is primarily designed for the physical mixing of granular raw materials. It is adaptable to a wide range of materials, capable of producing both conventional nitrogen, phosphorus, and potassium (NPK) compound fertilizers and customized functional fertilizers. It exhibits strong compatibility with raw material shape and particle size.

Conventional single-element fertilizers are the core applicable raw materials, including nitrogen fertilizers such as urea, ammonium sulfate, and ammonium chloride; phosphate fertilizers such as superphosphate, triple calcium carbonate, monoammonium phosphate, and diammonium phosphate; and potassium fertilizers such as potassium chloride, potassium sulfate, and potassium nitrate. These raw materials have uniform particle size and good flowability, and are not prone to stratification after mixing, making them the main raw materials for producing basic blended fertilizers.

Simultaneously, it can be combined with various micronutrient materials, such as granular calcium magnesium phosphate, granular boron fertilizer, zinc fertilizer, iron fertilizer, and magnesium sulfate, added according to the formula ratio to produce functional blended fertilizers rich in micronutrients, thus expanding the fertilizer's applicability.

Organic fertilizer raw materials are also suitable. Fermented and decomposed granular organic fertilizers, humic acid granules, amino acid granules, oilseed cake granules, and bio-fertilizer granules, when mixed with nitrogen, phosphorus, and potassium granules, can produce organic-inorganic compound fertilizers to meet the needs of green planting.

In addition, nitrate nitrogen fertilizers, slow-release fertilizer granules, controlled-release fertilizer granules, ammonium chloride granules, and potassium sulfate granular fertilizers can all be processed. They can also be mixed with some soil-improving fillers, such as granular attapulgite and fly ash granules.
NPK blending fertilizer production lines are not suitable for raw materials with excessive moisture content, excessive powder, or a tendency to clump and stick together. A uniform particle size of 2-4 mm is optimal. By rationally combining different raw materials, various NPK compound fertilizers, including general-purpose, specialized, slow-release, and organic-inorganic types, can be flexibly produced to suit various planting scenarios such as field crops, vegetables, and fruit trees.