METHOD FOR BIOLOGICAL ACTIVATION OF NATURAL ZEOLITE Russian patent published in 2005 - IPC

FIELD: agriculture, agricultural chemistry, fertilizers.

SUBSTANCE: invention relates to biologically active zeolite fertilizers containing potassium, phosphorus, calcium, trace elements and phosphate-mobilizing microorganisms. Method for biological activation of mordenite-containing tuff with fraction size below 2 mm involves its mixing in rocker for 2-4 h with an aqueous suspension of phosphate-mobilizing microorganisms containing 10⁹ cells/spores in the mass ratio = 1:(0.2-0.6) followed by keeping at temperature 4°C for 12 h and following drying up to the friable state. The prepared fertilizer consists of mordenite-containing tuff with fraction size below 2 mm and (4.5-8) x 10⁸ cells/spores of phosphate-mobilizing microorganisms. Using biologically activated mordenite-containing tuff in the dose 5 t per hectare as measure for 3 years provides increasing amount of phosphate-mobilizing soil microorganisms by 14-16 times and phosphatase activity by 3-4 times as compared with addition the same dose of conventional mordenite-containing tuff. Also, the content of mobile phosphorus in soil increases from 13-33 to 31-40 mg/kg, nitrate nitrogen from 18-31 to 21-48 mg/kg, and exchangeable potassium from 69-81 to 89-98 mg/kg.

EFFECT: improved method for activation, increased content of valuable components.

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