FIELD: agriculture, in particular, postharvest treatment of grain. SUBSTANCE: method involves creating grain flow in the form of rain and spraying propionic acid with the use of nitrous oxide to create aerosol flow for contacting with grain; before spraying, introducing into propionic acid preparation produced by extracting of Mortirerella dichotoma micromycet biomass in accordance with predetermined process. EFFECT: increased efficiency and enhanced reliability in operation. 2 ex
