FIELD: agriculture. SUBSTANCE: method involves cleaning grain from contaminants and treating with aerosol flow of propionic acid comprising additive of chitosan, with aerosol flow of propionic acid being preliminarily passed through supersonic horn. Source of chitosan is preparation produced by sequential extracting of Mortierella indohii micromycet biomass by predetermined process. EFFECT: increased efficiency by eliminating of grain surface microflora and reliable grain storage method. 2 ex
