COMPLEX GLASS FERTILIZER WITH PROLONGED EFFECT AND METHOD FOR ITS PREPARING Russian patent published in 2003 - IPC

FIELD: fertilizers, agriculture. SUBSTANCE: fertilizer comprises phosphate glass-like fertilizer containing P₂O₅, CaO, MgO, Fe₂O₃, MnO, CuO, B₂O₃, CoO, SiO₂,MoO₃,K₂O of the definite composition as a phosphorus-potassium fertilizer and trace elements and fully soluble linear-cyclic polymethylene urea is used as urea-formaldehyde resin in the following mass ratio of components: phosphate fertilizer, 75-90%; urea, 10-25%. Method for preparing fertilizer involves synthesis of urea-formaldehyde resin that is carried out at temperature 45 C for 2 h in neutral or weakly acid medium, pH is from 5 to 7. Phosphorus-potassium fertilizer as powder is added to the prepared urea liquid condensate followed by granulation of the prepared heterogeneous composite. Fertilizer provides the balanced nutrition of plants and exhibits universal properties due to the prolonged effect. The proposed fertilizer can be used for any crops for 3-5 years in a single addition to the soil. EFFECT: valuable properties of fertilizer. 2 cl, 1 tbl, 1 ex