Combines with a conventional rasp-bar cylinder, a single-rotor, or a double-rotor threshing mechanism were field tested in Amsoy-71 soybeans at three moisture contents to determine the effect of threshing mechanism on soybean quality. Each threshing mechanism was operated at four peripheral velocities. Composite threshing and separating losses were also collected. A separate field experiment was conducted at one harvest moisture and one peripheral velocity to determine the effect of concave clearance on threshing quality. Percentages of splits were significantly higher for the conventional cylinder than for either rotary threshing mechanism. However, when the conventional cylinder was operated within the manufacturer's recommended cylinder speed range, the splits from threshing did not exceed the allowable limits for USDA No. 1 grade soybeans. Composite threshing and separating losses ranged from 5. 8 to 18. 2 kg/ha with significantly higher losses at the slowest rotor speed for both rotary combines.
|Original language||English (US)|
|Journal||Paper - American Society of Agricultural Engineers|
|State||Published - 1978|
ASJC Scopus subject areas
- Agricultural and Biological Sciences (miscellaneous)