METHOD OF PRODUCING ORGANOMINERAL FERTILIZER Russian patent published in 2025 - IPC C05F3/00 

FIELD: agriculture.

SUBSTANCE: method of producing organomineral fertilizer involves mixing an organomineral mass with a gypsum-containing product. Organomineral mass used is poultry droppings kept in cages, or sewage sludge from gravity or hydraulic washing systems for removing manure, or sewage sludge from municipal aeration stations. Organomineral mass is preliminarily treated with acid in order to neutralize odour and destroy sticky colloidal structures, and the gypsum-containing product is dried to moisture content of not more than 5 % at temperature not higher than 320 °C and crushed. Prepared mixture is sent for composting, or for drying to moisture content of not more than 10±2 % for storage, or granulated. Gypsum-containing product and organomineral mass are taken in ratio of 1:(0.1-1.8) in finished mixture in case of composting or drying and in ratio from 1:(0.01-1) in case of granulation of finished mixture.

EFFECT: obtaining high-quality organomineral fertilizer with a long shelf life.

13 cl, 1 tbl