gumbo soil

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Noun1.gumbo soil - any of various fine-grained silty soils that become waxy and very sticky mud when saturated with water
dirt, soil - the part of the earth's surface consisting of humus and disintegrated rock
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The same year Charles was born, his father discovered the secret to making a plow from polished steel that would "scour" in the sticky gumbo soil of northern Illinois, a discovery that launched the elder Deere into the plow-making industry.
Gumbo soil is sticky when wet and concrete when dry.
I was familiar with slatted moldboards that offered less surface to which gumbo soil could stick and I assumed that was the only solution to the problem.