Multi-component fertilizers are formulated with two or three of the fundamental elements: nitrogen, phosphorus, and potassium. They can also include additional nutrients and essential micronutrients.
The manufacture of these fertilizers involves a chemical reaction between their different raw materials. Next, the semi-fluid compound, known as slurry, undergoes processes of granulation, drying, classification, and conditioning. The type of nitrogen present in these fertilizers can vary (nitric, ammoniacal, or uric), depending on the raw materials used.
For the creation of NPK-type fertilizers, essentially two different infrastructures are used: plants that operate through the acid blend and those that use the nitro phosphate method.