Purpose. Improving the efficiency of the combine harvester by establishing the effect its throughput (thresher loading) on the quality indicators of the grain separated by a preliminary threshing device. Methods. Experimental researches were carried out using the method planning and conducting single-factor experiments. The processing of experimental results was carried out taking into account the methods by regression analysis. The approximation of the experimental dependencies by the mathematical model was performed using the least squares method using the statistical software package STATISTIKA-6.5. Results. A combined technological process transportation and threshing of grain-straw mass (GSM) was developed, which is based on a preliminary threshing device and takes into account the differences in the interaction of GSM with the device drum bars. The identity the processes change in the energy of germination and seed germination culture germination depending on the level loading for all the considered device options is noted. For each device option, a rational value throughput is established, which corresponds to a high level of germination energy. Conclusions. The highest germination energy level harvested grain is 99% set for a header, the drum of which contains four strips, when the combine thresher is loaded at 7.5 kg/s. For a serial header, a high germination rate of 92% is set when the thresher is loaded at 8.5–9.5 kg/s; for a header with a preliminary threshing device with a whip under the drum at 97% when loading 6–7 kg/s; for a header with a smooth drum 94.0–94.5% with a threshing load of 8–9 kg/s; for the reaper, the drum of which contains two strips about 95% when loading the thresher 3–4 kg/s, respectively. Comparing with the serial, for a header with the four slats drum, a higher 7% level of seed germination has been noted with a slight (1.0–1.5 kg/s) reduction in the capacity of the combine. Keywords: combine harvester, header, device for preliminary threshing of grain, grain-straw mass, germination energy, seed germination.
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