Minimization of Soil Pollution as a Result of the Use of Encapsulated Mineral Fertilizers

Abstract

The application of nitrogen fertilizers allows increasing crop yields and partially increase the natural soil fertility. They have a negative influence on the environment due to the significant release of nitrogen. Hence, the technology for decreasing of N-release is proposed in this work. The obtaining of complex organo-mineral NPK fertilizers by encapsulating a carbamide granule with a phosphate-potassium shell with humates is the main aim of this work. The main tasks of this shell are the nitrogen and phosphate nutrients slow release from the granules into the soil following the agrochemical needs of plants and the prevention of soil pollution. The powdered components agglomeration of phosphate and potassium fertilizers with a small amount of liquid phase (plasticizer) allows forming a phosphate-containing coating on a carbamide core by the semi-dry method. This innovation allows organizing the production of such a product at the average enterprise with less capital investment. Carbamide prills, phosphate-glauconite concentrate, calcium and potassium ballast humate, and trace-element chelate complex “Avatar” were used in experimental studies. A preliminary assessment of the market prospects for such an innovation shows a high level of market attractiveness for all market participants: producers, consumers, and society.

Keywords

• phosphates
• carbamide
• calcium and potassium humates
• organo-mineral fertilizers
• "avatar" trace-element complex