Abstract
For normal threshing procedure, parameters of 5 different spring wheat varieties (Opal, Orca, Peko, Jufy, and Gaby) were compared: the threshing of the kernels, loose ears and the amount of broken straw and chaff. For an exact assessment of the ripeness of the crop it is necessary to have a fair criterion for comparison of the different varieties. The frequently used eosine colour method does not give an exact indication of the ripeness stage. For seed, it is better to measure the hardness of the kernels. Although we could not measure an exact correlation between our plot parameters and the field losses of the combine harvester, we can give a correct rank order for the different varieties. If the suitability of new varieties for combine harvesting is to be tested, a good knowledge of the ripeness stage is necessary. The straw-shaker losses are fairly well characterized by the percentage threshed and the percentage of broken straw and chaff. Loose ears have an influence on the sieve losses.
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