- References
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]References1. ^http://billingsgazette.com/lifestyles/there-s-science-behind-sticky-gumbo-soil/article_8c6c31ef-2b94-5122-b52c-7113644c656c.html
2. ^http://www.dakotafarmer.com/story-drought-tested-till-9-131661
2 : Types of soil|Horticulture and gardening |