Cooperative Studies on the Effects of Height of Ridge, Nitrogen Supply, and Time of Harvest on Yield and Flesh Color of the Porto Rico Sweetpotato

by Benton Mehrling Stahl, Charles William Loomer, Elsa Orent-Keiles, James Robert Dawson, M. A. Yothers, Myron Francis Babb, Roy Wesley Nixon, William Perry Baird, David Victor Kopland, Frank Waldemar Carlson, James Ellsworth Kraus, Maurice E. Dahmus, Vernon Webster Johnson, Roy Magruder · 1949