LABORATORY MANUAL IN FIELD CROPS 29 



PRACTICUM NO. 22 



Object. To Practice Comparative Judging of Oats on the 

 Standard Grades. 



Materials. One quart of samples of market oats. 



Method. Follow the same method as outlined for the com- 

 parative judging of wheat in Practicum No. 15, p. 19. In- 

 dividual work is very important in this practicum. 



Weigh out a ten gram sample, separate from the grain all 

 the foreign matter, weed seeds, straw, dirt, etc., and then de- 

 termine the percentage of pure seed by weight. 



Determine by the germination test the percentage of viable 

 seeds in forty-eight hours. 



The percentage of viable multiplied by the percentage of 

 pure seeds equals the percentage of pure viable seeds in the 

 sample. 



STUDIES 



1 . Of what value is the pure viable seed test ? 



REFERENCES 



Livingston's Field Crop Production, pp. 374-377. 



Lyon and Montgomery's Examining and Grading Grain, pp. 94-99. 



