Courtesy of O. H. Sears, Univ. of Illinois 

 A. S\inpU)nis oi nitrogen deficiency appear in nninoculated soylicans growini; in a soil which 

 does not contain the appropriate nitrogen-fixing nodule bacteria. Note the pale green to 

 vellowish color and the lower height of the plants in the nninoculated check strip. 



V>. Coltoii boil showing potassinm-deficicnc \ sMuplonis. Left, normal, large, well oj)encd boll. 

 Riglu. small, inniialure, ])artlv o[)enecl Ixill icsniiing liom a deficiency of potassium. 



Plate I. Nitrogen and polassjnm deficiencies in planis. 



