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; providing passage of aerosol flow of propionic acid through supersonic horn for contacting with grain flow. Source of chitosan additive is preparation produced by sequential extracting of Pythium irregulare 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
