UNITED STATES 



DEPARTMENT OF AGRICULTURE 



CIRCULAR No. 421 



Washington, D. C 



January 1937 



RESULTS OF FIELD CROP, 

 SHELTERRELT, AND ORCHARD INVES- 

 TIGATIONS AT THE UNITED STATES 

 DRY LAND FIELD STATION, 

 ARDMORE, S. DAE., 1911-32 



By 

 OSCAR R. MATHEWS 



Senior Agronomist 

 and 



VERNER I. CLARK 



Former Scientific Aide 



Division of Dry Land Agriculture 



Bureau of Plant Industry 



For sale by the Superintendent of Documents, Washington, D. C. 



Price 10 cents 



