METHOD FOR PREPARING COMPLEX MICROFERTILIZER AND MICROFERTILIZER Russian patent published in 2005 - IPC

FIELD: agriculture, fertilizers.

SUBSTANCE: method for preparing the complex microfertilizer involves stirring humin-containing components with alkali an aqueous solution. Sodium (potassium) hydroxide an aqueous solution is used as alkali. Method involves addition trace elements for plants nutrition to the solution, among them copper sulfate and accessory substances - elements for mineral nutrition, among them zinc sulfate or magnesium sulfate. Method involves additional using manganese sulfate, polyvinyl alcohol as a sticking agent and Trilon B as a chelating agent. Lignin is used as a humin-containing component that is added to alkali solution by portions at constant stirring, brought about to boiling, converted to the state of stable suspension and kept for 50-60 min. Then water is added, brought about to boiling and kept for 20 min followed by mixing the suspension with solution of zinc sulfate, manganese sulfate, ammonium molybdate, copper sulfate, cobalt sulfate, Trilon B in water heated to 50°C. Stirring is carried out for 20 min followed by addition to microfertilizer organic sticking agent as solution of polyvinyl alcohol in water heated preliminary to 70°C being polyvinyl alcohol is kept to the complete dissolving. Prepared microfertilizer comprises polyvinyl alcohol as a sticking agent in 5% solution in the following ratio of components, wt.-%: zinc sulfate, 0.44; copper sulfate, 0.05; cobalt sulfate, 0.02; manganese sulfate, 0.05; ammonium molybdate, 0.04; Trilon B, 1.0; sticking agent, 5.0; humic acids, 93.0. Invention provides enhancing quality of microfertilizer, to reduce cost, to exclude evolving harmful substances to the environment and to increase the yield of the ready product. Invention can be used in manufacturing ecologically pure complex lignin-base microfertilizers.

EFFECT: improved method for preparing, improved and valuable properties of microfertilizer.

3 cl, 3 tbl, 4 ex