Response of corn yields in a planosol soil to surface drainage, cropping system and variable fertilizer treatments /
Beer, C. E.(Craig Eugene),1927-
David, H. T.(Herbert T.),author.
Shrader, W. D.(William Duncan),author.
Iowa State University.Agricultural and Home Economics Experiment Station.
Iowa State University.Department of Agricultural Engineering.
Iowa State University.Department of Statistics.
Iowa State University.Department of Agronomy.
Title from front cover.
Includes bibliographical references.