Pattern of seed losses and damage during soybean harvest with grain combine harvesters
 
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Department of Horticultural Machinery, University of Agriculture, Głęboka 28, 20-612 Lublin, Poland
Acceptance date: 1998-01-05
 
Int. Agrophys. 1999, 13(1): 103–107
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ABSTRACT
In the paper the results of a five year investigation on harvesting the Progres soybean variety of Polish origin with combine harvesters are presented. This variety is characterized by low podding height of the lowest pods. At the Institute of Agricultural Mechanization of the University of Agriculture in Lublin a design of a tracing cutting assembly was developed whose main objective was to reduce the cutting height of the grain combine harvester. In the following investigation two types of the Z056 Bizon-Super grain combine harvester were compared: one with the standard cutting assembly and the other with the tracing cutting assembly. The results showed that the use of the tracing cutting assembly led to an average reduction of total seed losses from 17.4% to 5.3%. Average losses caused by headers equipped with the tracing cutting assembly were 4.5% compared to the16.5% typical of the standard design. The losses caused by the threshing assembly averaged 0.84% for both types of the harvester. Of the total losses caused by the headers, seeds from pods attached to the stubble made up the biggest fraction. This fraction amounted to 2.1% for the harvesters equipped with the tracing cutting assembly and 8.3% for the standard harvesters. Mechanical damage of soybean seeds was about 9.9%; of this amount 4.6% was macrodamage and 5.3% microdamage.
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