Frost heaving is a serious hazard to the maintenance of legume stands on many of our Iowa soils - especially on level claypan soils. But there are some things you can do to reduce your frost heaving losses.
Nicholson, R. P.; Scholl, J. M.; and Shrader, W. D.
"Is Frost Heaving Killing Your Legumes?,"
Iowa Farm Science: Vol. 7
, Article 7.
Available at: https://lib.dr.iastate.edu/farmscience/vol7/iss10/7