Crop response surfaces and economic optima in fertilizer use /
Heady, Earl O.(Earl Orel),1916-1986,author.
Pesek, John T.,author.
Brown, William G.(William Galen),author.
Iowa State College.Agricultural Experiment Station.
Iowa State College.Department of Agronomy.
Iowa State College.Department of Economics and Sociology.
Tennessee Valley Authority.
Title from front cover.
Includes bibliographical references (page 332).