Submitted to: Popular Publication
Publication Type: Popular Publication
Publication Acceptance Date: 8/18/2011
Publication Date: N/A
Technical Abstract: Each time a non-row-crop machine makes a pass in the field, it is favorable for the operator to overlap slightly into the previous pass where the crop has already been cut. Another option would be to undercut and leave a strip of crop standing. In this study, overlap loss was explored through a controlled experiment, as well as through on-farm survey. The experimental portion employed a factorial design to study the influence of two drivers and three cutting speeds (6.4, 9.7 and 12.9 km/h) of a self-propelled windrower. Driver experience and mowing speed were not found to have a significant effect on overlap. However, the interaction of inexperienced operators and higher mowing speeds increased overlap. The on-farm survey included three mower configurations: pull-type, self-propelled windrower, and mounted. Cutting widths ranged from 4.01 to 9.60 m, with a variety of field conditions on 15 farms. Three of the mounted mowers and one self-propelled windrower utilized automatic guidance. Surveyed overlap ranged from 0.4 to 16.13% of machine cutting width. Average loss was 5% of cutting width. Automatic guidance has been purported to improve efficiency by eliminating time spent covering already mowed ground, reducing operator fatigue, and ensuring a uniform cutting pattern and swath density. The use of a GNSS-based guidance system to steer the mower was shown to reduce overlap loss from 5.03% to 2.34%.