FIELD: agricultural production. SUBSTANCE: plant growth promoting material has magnetic substance coated with polymeric compound. Magnetic substance is manufactured in the form of filamentary articles or pellets of 1-10 mm diameter. Filament or pellet section may have any shape convenient for manufacture. Iron-base alloys possessing magnetic properties may be used as magnetic substance. EFFECT: increased efficiency and improved crop yield. 3 cl, 1 tbl
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