BULLETIN OF THE 



:o 



No. 168 



Contribution from the Bureau of Plant Industry, Wm. A. Taylor, Chief 

 July 15, 1915. 



GRADES FOE COMMERCIAL CORN. 



ByJ.W.T. Dtjvel, 



Crop Technologist in Charge of Grain-Standardization Investigations. 



CLASSIFICATION OF CORN. 



By virtue of the authority vested in the Secretary of Agriculture 

 by the acts of Congress of June 30, 1906 (34 Stat., 669), and of 

 March 4, 1913 (37 Stat., 828), to fix definite grades of grain, the grades 

 for corn shown in Table I were fixed and promulgated on January 

 3, 1914, to take effect on July 1, 1914. 



Table I. — Grade classification of white, yellow, and mixed corn, showing maximum 

 allowances of moisture and other factors . 



Grade class 

 ification. 



Maximum allowances of- 



Moisture 



Damaged corn. 



Foreign 



material, 



including 



dirt, cob; 



other 



grains, 



finely 



broken 



corn, etc. 



"Cracked" 

 corn, not 

 including 

 finely 

 broken 

 corn. (See 



general 

 rule No. 9.) 



No. 1 



Pe 



r cent. 

 14.0 



No. 2 





15.5 



No. 3 





17.5 



No. 4 





19.5 



No. 5 





21.5 



No. 6 





23.0 



Sample 







2 per cent (exclusive of heat-damaged or mahogany 

 kernels) 



4 per cent (exclusive of heat-damaged or mahogany 

 kernels) 



6 per cent (exclusive of heat-damaged or mahogany 

 kernels) 



8 per cent (may include heat-damaged or mahogany 

 kernels not to exceed one-half of 1 per cent) 



10 per cent (may include heat-damaged or mahogany 

 kernels not to exceed 1 per cent) 



15 per cent (may include heat-damaged or mahogany 

 kernels not to exceed 3 per cent) 



See general rule No. 6 for sample grade 



Per cent. 



Per cent. 



GENERAL RULES. 



(1) The corn in grades No. 1 to No. 5, inclusive, must be sweet. 



(2) "White corn, all grades, shall be at least 98 per cent white. 



(3) Yellow corn, all grades, shall be at least 95 per cent yellow. 



(4) Mixed corn, all grades, shall include corn of various colors not coming within 

 the limits for color as provided for under white or yellow corn. 



71227°— Bull. 168—15 1 



