The harvest of buckwheat we can perform multiphase, double phase, and single phase. Characteristic to the grain combine harvesters used in harvesting of buckwheat is to perform single phase harvest, while achieving the different qualities of work. Quality of combines work depends on a numerous of factors: the state of crops, defining the relevant parameters for combine’s work, technical soundness, and operator’s skills. When the relevant parameters are not well coordinated, impairs the quality of work is significantly, resulting in increased losses of buckwheat grain and a high proportion of impurities in harvested mass of buckwheat in the combines bunker. The aim of our two-year study was to determine the amount of realized losses of buckwheat seeds by harvest device of combines Z 132 and Z 143, in buckwheat harvesting , as the most present in the investigated area. The method is based on the determination of losses of buckwheat seeds in the harvesting device   depending on the interspaces  underdrum-drum at the entrance, as well as the quality of harvested mass of buckwheat in the combine bunker (content of whole, broken, poorly grains and other impurities). Losses at harvesting device are being determined by setting the appropriate container, combining the movement between the front and rear wheels diagonally or obliquely at an angle of 10-20 0 ,  with respect to the direction of movement. Quality of harvested mass was determined by taking samples from the harvester’s bunker, and determining the percentage of healthy (whole), broken grains and impurities was later carried out in laboratory conditions. During the sampling, the number of samples were  recorded as well as working regime of combines. Applied methodology is standard for this issue and relates to the field-testing laboratory, and exploitation testing of grain harvesting   combines in single-phase harvest of buckwheat. The highest losses on harvesting device were  recorded at  ombine  Z 132 9,56 kg ha -1 , and the lowest at combine   Z 143 - 4.84 kg ha -1 . The highest content of whole buckwheat grains in harvested mass was at Z 143 and it was 95.32%, and lowest at combine Z 132  in amount of 92.55%. Based on these results it was concluded that the harvester Z 143 had better quality of work comparing   the combine Z 132, because there have been achieved  lower losses of buckwheat seeds, in the  to harvesting  device, with more whole grains content, with significantly smaller proportion of impurities to the other investigated combine.

combine; buckwheat; harvest; losses; grain

Presentation: oral