EN
On the basis of agricultural science and principles of animal nutrition 125 models of farms of differentiated area and production structure have been worked out. The analysis of the mechanization and labour costs in plant production was done with alternative machine aggerates which are based on three classes of tractors, namely 6 kN, 9 kN, 14 kN. Estimated hourly costs of machine work were compared with service prices and the area and production structure at which purchase of individual machines was profitable were determined.