Program Committee 



DAMON BOYNTON 



American Society of Horticultural Science 



JACKSON B. HESTER 



Fertilizer Section, American Chemical Society 



W. F. LOEHWING 



American Society of Plant Physiologists 



D. D. LONG 



Plant Food Research Committee, National Fertilizer Association 



M. H. McVICKAR 



National Fertilizer Association 



A. G. NORMAN 



Chemical Corps, War Department 



ROBERT A. STEINBERG 

 Botanical Society of America 



EMILTRUOG, Chairman 

 Soil Science Society of America 



G. W. VOLK 



American Society of Agronomy 



C. H. WADLEIGH 



American Society of Plant Psysiologists 



ROBERT B. WITHROW 



Smithsonian Institution 



