Encapsulated organic–mineral fertilizers with nanoporous structure

Research to obtain a long-acting encapsulated fertilizer has been carried out. The performed physicochemical studies confirmed the production of a high-quality phosphate-containing shell on the carbamide prill surface. Solubility of proposed samples were analyzed. The effectiveness of the developed compositions of the encapsulated fertilizer shell was determined. Studies in soil columns were carried out to assess nitrogen leaching. The method of scanning microscopy with elemental microanalysis was used to study the quantitative and qualitative characteristics of the shell and the interface between the outer phosphate layer of the coating and the surface of the urea prill. It is shown that the presence of deep tortuous nanopores in the structure of the phosphate-containing coating allows the penetration of soil moisture into the granule and the successive dissolution of the organic part of the shell and the nitrogen core of the encapsulated granule.