LIQUID ORGANOMINERAL HUMIN FERTILIZER Russian patent published in 2003 - IPC

FIELD: fertilizers. SUBSTANCE: fertilizer, which can be prepared from natural-origin humate-containing products, and comprises humus acids, assimilable nitrogen, phosphorus, and potassium. In particular, fertilizer is prepared by treating sapropel with potassium pyrophosphate at weight ratio 4: 1 and its watered form contains, g/l: humin acids, 2.0-4.0; fulvic acids, 0.92-1.8; phosphorus (on conversion to P₂O₅), 8.0-10.0; potassium (on conversion to K₂O), 14.4-16.0; and nitrogen, up to 0.32. Fertilizer may also contain 10% of urea. EFFECT: increased soil fertility. 3 cl, 4 ex