Timely use of the rotary hoe is an effective killer for weeds in soybeams. In this article, three Iowa State College scientists report directly to you on their tests comparing different weed-control methods.
Weber, C. R.; Staniforth, D. W.; and Lovely, W. G.
"A Killer for Weeds in Soybeans,"
Iowa Farm Science: Vol. 12
, Article 6.
Available at: https://lib.dr.iastate.edu/farmscience/vol12/iss10/6