The quality of silages made from raw potatoes preserved preliminary with sulphuric, hydrochloric, phosphoric and formic acid and with the Acidol preparation was compared with that of silages made in acid whey. The period of ensiling whole tubers in whey pickle is approximately fourfold longer than that of ensiling tubers without peel and/or cut tubers. Tubers cut into pieces are ensiling as quickly as suedes, beets, pumpkin or cabbage. In the whey pickle tubers damaged during harvest and tubers infested by dry rot can be ensiled. This ensiling way is not suitable for tubers heavily infected by soft rot. Silages made from raw potatoes preserved with acids have got the estimates from bad to statisfactory. The quality of silages made in whey pickle was good or very good. Potatoes ensiled in whey contain a very low amount of butyric acid and are willingly eaten by pigs.