Soybean yields and plant composition as affected by phosphorus and potassium fertilizers /
Miller, R. J.,author.
Pesek, John T.,author.
Hanway, John J.(John Joseph),1920-author.
Dumenil, L. C.,author.
Iowa State University.Agricultural and Home Economics Experiment Station.
Iowa State University.Department of Agronomy.
Title from front cover.
Includes bibliographical references (page 67).