BULLETIN or THE 
No. 168 
Contribution from the Bureau of Plant Industry, Wm. A. Taylor. Chief. 
July 15, 1915. 
GRADES FOR COMMERCIAL CORN. 
ByJ.^Y. T. DuvEL, 
Crop Technologist in Charge of Groin-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.— Grat/e 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.l 
Per cent. 
14.0 
No. 2 
1.5. 5 
No. 3 
17.5 
No. 4 
19.5 
No 
21 5 
No. G 
2.3.0 
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. 
1 
1 
2 
2 
3 
5 
Per cent. 
GENERAL RULES. 
(1) The corn in grades No. 1 to No. 5, inclusive, must be sweet. 
(2) "Wliite 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 pro\T.ded for under white or yellow corn. 
71227°— Bull. 168—15 1 
