Fertilizer production functions for corn and oats : including an analysis of irrigated and residual response /
Doll, John P.,author.
Heady, Earl O.(Earl Orel),1916-1986,author.
Pesek, John T.,author.
Iowa State College.Agricultural and Home Economics Experiment Station.
Iowa State College.Department of Economics and Sociology.
Iowa State College.Department of Agronomy.
Title from front cover.
Includes bibliographical references.