One of the major environmental initiatives of current commodity programs is Conservation Compliance, a provision that requires highly erodible land to be cropped according to a locally approved conservation plan.
Babcock, Bruce A.; Chaherli, Nabil M.; and Lakshminarayan, P. G.
"Conservation Tillage and Farm Programs,"
Iowa Ag Review: Vol. 1
, Article 1.
Available at: http://lib.dr.iastate.edu/iowaagreview/vol1/iss4/1