It's a test for healthy soil.
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What is the 'Soil Your Undies' challenge? - Farm and Dairy
Why this conservation group thinks soiled undies are a good thing
The only time you want to see holes in your undies - Napa Master
Boxers or Briefs? As Long as They're Cotton, They'll Dish the Dirt on Soil
Soil Your Undies Challenge – McLean County Ag in the Classroom
Soil My Undies Challenge: Measuring Soil Biology with a Pair of
Farmers in southern Minn. test soil health with buried undies
Soil Your Undies 2021: driving Baltic soil health by soiling pants, by eAgronom
Soil Your Undies Campaign Northern Virginia Soil and Water
South West Water wants farmers to bury their underpants - and this
I see London, I see France, farmers buried underpants to demonstrate conservation benefits – St. Croix 360
Soil Your Undies Lesson: By Rachel Wilson - Seed St. Louis