It's a test for healthy soil.
Soil Your Undies Experiment
Buried underwear proves good soil in private gardens - SWI
Soil My Undies” Challenge Has Farmers Burying Underwear In Their
How to Test Soil Health on Your Farm: 10 Key Methods
Gotchies for your garden? How soiling your undies can determine the health of your soil
Soil Your Undies experiment a Canadian hit
Underpants experiments are taking place in Australian paddocks and
Soil Your Undies 2023 - Oswego Lake Watershed Council
Minnesota farmers use buried underwear to test soil health
Soil Your Undies Challenge – McLean County Ag in the Classroom