METHOD FOR PREPARATION OF SOLUTION FOR SUPPLEMENTARY FEEDING OF FRUIT TREES Russian patent published in 2016 - IPC C05D9/02 C01G49/08 H01F1/28 

FIELD: agriculture.

SUBSTANCE: for preparing solution for supplementary feeding of fruit trees starting solution is prepared by mixing FeSO₄ solution with hydrogen peroxide. To obtained solution containing ions of Fe²⁺ and Fe³⁺, excess of alkali is added and fine particles of magnetite are deposited. For deposition of magnetite particles NaOH, KOH, NH₄OH are used. Large portion of mother solution is removed by centrifugation. Magnetite particles stabilisation is carried out by surfactant in form of naphthenic acids, boiling out at temperature within range of 150-250 °C at pressure of 5 mm Hg. Then peptisation of stabilised particles in aqueous medium is carried out while heating at temperature 60-80 °C with continuous mixing.

EFFECT: invention simplifies preparation of colloidal solution of magnetite in aqueous medium, higher stability and efficiency when using supplementary feeding for fruit trees.

2 cl, 1 ex