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This paper shows the losses created during alfalfa mowing process performed by oscillatory mower with classic cutting apparatus. The losses detected during research process have been divided into two groups: losses caused by increased incision height (over 6 cm), and losses caused by crushing. The total losses made during mowing by the tested mower were calculated by adding the incision height losses and crushing losses. The research results indicate that the minimal losses caused by the incision height are 0.57 % of yields, at the aggregate mowing speed of 3.82 km/h. Aggregate mowing speed increase tend to slightly increase the losses up to maximum values of 1.17 % at the mowing speed of 8.17 km/h. The crunching losses ranged from minimal 0.31 % at the minimal aggregate mowing speed. The average total losses were 1.18 % of yields at the average aggregate mowing speed of 5.76 km/h.

Intensive crop production is based on the use of various means of mechanization. Significant place in applied mechanization take sowing aggregates. Emphasizing the importance of applied sowing aggregates and their technological characteristics and quality of work (appropriate and optimal deployment of seed depth, length and width of the sowing layer) is understandable, especially if one takes into account the fact that an omission made in the technological process of sowing later practically almost can't be removed. The aim of our study was based on field-laboratory and terrain to test the mechanical seeders 634.23 IMT in sowing rye, determination quality and reliability of drill work. Based on these results it was concluded that in terms of proper adjustment of drill and well-executed presowing preparation, planter IMT 634.23 can achieve a good distribution of seeds of rye on the surface, with a spacing of 40-60 mm over 60% of seeds. Transverse distribution of seed rye was satisfactory, given that the highest content of rye seeds were grouped at a distance of 120-140 mm and amounted to over 65%. No marked significant differences in seeding depth intervals in the group which have been investigated. IMT 634.23 seeder can be used successfully for sowing rye and it belongs to a group of reliable seeder with good productivity and reliability that has been shown during operation.