The investigations were made in order to find sources and reasons of quality losses in typical handling of rape. Samples were taken before and after succeeding operations to estimate the influence of each of them on physical state of seeds. The estimation was curried out with simultaneous registration of working parameters of machines. Evaluation of damage was made according to methods elaborated in the Institute of Agrophysics, which allow to measure the amount of micro and macro damage as well as the amount of foreign material. Moisture content of seed was also measure during the study. The decrease of quality features of seed was noticed after each handling operation. However harvesting acted the most negatively and the level of damage noticed after harvesting decided about the amount of damaged seeds at the end of postharvest operations on rape. Drying caused the increase of macrodamage and decrease of microdamage. The amount of microdamage increased in transport. The moisture content after drying was correct according to standards.
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