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Due to limited resource potentials in crop production it's essential to find reserves to increase the efficiency of mechanized processes. Due to the lack of technical and human resources, there is a need to increase the daily and seasonal performance of machine-tractor units. The daily productivity of sowing units can be higher due to reducing downtime periods per shifts. Thus, downtime periods are chronometrically studied to identify their major causes. The seasonal loading of sowing units can also be increased due to agricultural practices. The analytically described relations of sowing and harvesting processes and their parameters prove sowing periods of crops with different growing seasons to be significantly increased due to cultivation practices with the fewer sowing units being necessary. [ABSTRACT FROM AUTHOR]

Development of the worn machinery market on the former USSR and availability of the commercial farm units with varying areas of cereal cropping causes the necessity in grounding the economically viable correlation between the combine harvester season load and its technical readiness. It is determined that on the increasing the combine harvester season load from 150 to 350 hectares the rational operational readiness must be raised from 0,4 to 0.85, the repair time must be decreased from six hours to half an hour and the mean time between failures must be raised from six hours to twenty hours. It is possible to ensure these activities by means of repair-servicing correlations, increasing the number of participants in eliminating the consequences of failure and forming the fund of the changeable spare parts, their timely delivery to the mobile units, using the aggregate repair method. [ABSTRACT FROM AUTHOR]