Weeds are tough competitors with all crops. And the corn years of your rotation provide as good an opportunity as you'll get to really kill weeds.
Staniforth, D. W.; Sylwester, E. P.; and Lovely, W. G.
"Weed Control in Corn,"
Iowa Farm Science: Vol. 11
, Article 2.
Available at: https://lib.dr.iastate.edu/farmscience/vol11/iss10/2