FIELD: agriculture. SUBSTANCE: apparatus has vertical contact chamber with grain charging, dispensing and discharge devices, water and propionic acid supply sources and spraying devices. Apparatus is further provided with ultrasound source, core-type longitudinal vibration concentrator and DC source. Water and propionic acid spraying devices are made independent. Longitudinal vibration concentrators are connected with opposite phases of DC source. EFFECT: increased efficiency, reduced consumption of preservative and simplified construction. 1 dwg
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