“…The effect of phosphorous on iron utilization by plants is reported by: Aiyar, 1948;Biddulph, 1948;Bonner and Eombyn, 1931;Brock, 1937;Brown and others, 1955;Clark, H. W., 1936;Cooper, 1939;Curry and Wilson, 1955;Davis, 1943;De and Basu, 1949;De Kock, 1955b;Dell'Aquila and Bini, 1953;Demolon and Bastisse, 1938;Einsele, 1936aEinsele, , 1936bFranco and Loomis, 1947;Goldberg, 1952;Hester and Shelton, 1947;Hopkins and Wann, 1927;Hutchinson, 1941;lyengar, 1936;Kahler, 1956;Kapp, 1938;McDonald, 1935;Midgley, 1940;Minami and others, 1955;Ohira, 1955;Pobeguin, 1954;Sarishvili and Bagaturiya, 1938;Sideris and Young, 1956;Willis, 1936;Zicker and others, 1956. Potassium is reported by Aiyar (1948), Eckstein and Jacob (1929), Gouny and Mazoyer (1954), Schachtschabel (1942), Scharrer and Schropp (1933), and Willis (1936) to affect the use of iron by plants.…”