NPK fertilizers are complex, highly effective combined fertilizers with chemically integrated macro and secondary nutrients in the grid of the granule. They are manufactured on the basis of monoammonium phosphate through neutralization of nitric and phosphoric acid and supplementary addition of potassium salts. After granulation they are covered by slowly soluble in water layer of magnesium oxide MgO and sulfur trioxide SO3, aimed at the exercise of control over the velocity of release of nutrients.

As compared to conventional fertilziers, fertilizers with multi-layer coverage of sulfur offer bigger flexibility in the determination of the scheme of action over various crops. The balanced contents of nutrients guarantee consecutive, effective separation of the needed quantities of nourishing ingredients, which should satisfy of full value the needs of the plants in each stage of their development. The use of NPK fertilizers guarantees maximal effectiveness of the funds input and provides balanced supply of nutrients of full value.