Combines working in wet conditions to harvest crops have formed ruts in fields. About three-fourths of combine mass and virtually all of loaded grain tank weight are carried on the combine front axle. With good yields, grain tank extensions, and a 12-row head, front axle load can be 18 to 20 tons.
Iowa State University
Hanna, H. Mark and Al-Kaisi, Mahdi, "Soil Management of Harvest Ruts" (2009). Integrated Crop Management News. 504.
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