FIELD: agriculture. SUBSTANCE: method involves ozonolysis of resinous-asphaltene low-sulfur oils and bitumens of naphthenic type. Ozonolysis products were hydrolyzed by heating with alkali aqueous solution followed by acidification to pH = 1-2 with KOH solution to pH = 8-9 and drying the obtained salts. Water-soluble potassium salts of polyfunctional carboxylic acids were used as 0.001-0.01% aqueous solution for seeds treatment before sowing. EFFECT: improved method of preparing. 6 tbl
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