Combine loss and grain cleanliness in Kansas hard winter wheat Academic Article uri icon


  • A survey designed to explore combine processing loss and grain cleanliness during the 1994 and 1995 Kansas wheat harvests was performed in an attempt to provide new information for the debate over the economic feasibility of cleaning wheat. Average combine processing losses for 1994 and 1995 were 4.2 and 4.4%, respectively. The dockage contents were 0.6 and 4.8% for 1994 and 1995, respectively. Grain lost from the combine was significantly smaller in diameter, lighter weight, and more variable compared with wheat collected by the combine. Regression analysis indicated that the harvest rate (bushel of wheat processed per hour), material other than grain, and cylinder speed best described the amount of variability in dockage among wheat samples collected in the combine after processing. Harvest rate, harvest rate squared, and the interaction between harvest rate and sieve opening best described the variation in combine loss during processing.

published proceedings

  • Cereal Foods World

author list (cited authors)

  • Herrman, T. J., Loughin, T. M., & Schrock, M. D.

complete list of authors

  • Herrman, TJ||Loughin, TM||Schrock, MD

publication date

  • November 1997