An experimental model of a potato planting machine for germinated potatoes has been developed for mountain farming. The design of a planting unit, which is a soundvalve type, is expected to improve the quality of planting. The potato planting machine has been tested in four experimental fields both in plain and mountain conditions. The main quality and operational indicators of the model have been determined. The obtained parameters of the quality indicators completely meet modern agro-technical requirements for planting germinated potatoes. The machine performance is thus comparable with that of the existing machines of the considered type.