Gumbo (soil)

Gumbo soil is a mixture which often has some small amounts of sand and/or organic material, but is typically defined by the overwhelming presence of very fine particles of clay.[1]

Missouri gumbo soil with soybean seedlings

Northern Missouri "no-till" soybean crop in gumbo soil

Although gumbo soils are exceptional at water retention, they can be difficult to farm, as precipitation will turn gumbo into a unique muddy mess that is challenging to work using large commercial farming equipment. Avoiding tillage of this type of soil through no-till farming appears strongly correlated with higher yields, as compared to more traditional tilling practices.[2]