102 LABORATORY MANUAL OF AGRICULTURE 



Size. Separate the sample into the following groups for 

 size: large kernels; medium-size kernels; small kernels. 

 Weigh and record the weight and per cent of each group. 

 The total for size should be 100 per cent. 



Separate from the sample one hundred average-size ker- 

 nels. Weigh them and record their weight. Compare the 

 weight of one hundred average-size kernels in the different 

 samples studied. 



The weight per bushel may be determined by using the 

 weight-per-bushel tester. Determine the weight per bushel 

 of the sample by pouring the corn in very lightly over the top 

 or side of the tester and without shaking or packing. Draw 

 the bar or straight edge once across the top of the tester so 

 that it will be filled just level with the top. Adjust the 

 tester by moving the weight out on the bar until it just bal- 

 ances. The scale on the bar by the weight indicates the 

 weight per bushel. Record weight per bushel of sample. 



The commercial grade is determined by the foregoing 

 factors, and a grade is given according to the quality of the 

 sample. The grain inspection departments of the various 

 states provide rules for the inspection and grading of corn. 

 The following rules govern the inspection of corn in Kansas : 



White Corn 



No. 1. White Corn. Shall be pure white corn and sweet. 



No. 2. White Corn. Shall be fifteen-sixteenths white and 

 sweet. 



No. 3. White Corn. Shall be fifteen-sixteenths white and 

 sweet. 



