"Super cracks" are being found in farm fields in a number of Iowa counties following the recent dry seasons. And they're hazardous-to you, your machinery and livestock. Here's what we can tell you about them.
Engelstad, O. P.; Shrader, W. D.; and Duncan, E. R.
"Super Cracks in Your Fields?,"
Iowa Farm Science: Vol. 13
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol13/iss1/4