FIELD: agriculture. SUBSTANCE: method involves cleaning grain from contaminants; creating grain flow in the form of falling rain; creating aerosol flow of propionic acid comprising additive of chitosan; passing aerosol flow of propionic acid through supersonic horn for contacting with grain. Source of chitosan is preparation produced by sequential extracting of Pythium insidiosum micromycet biomass with the use of non-polar extractant in above-critical state, water, alkaline, water, acid, water, alkaline and water, with following joining of first extract with solid residue. EFFECT: reliable grain storage method. 2 ex
