EXERCISE 23. GRAIN SCREENINGS 



(Reference, Productive Feeding, Chapter XVI) 



Weigh out two portions of 10 grams each and separate them into four 

 different parts as follows: (1) kernels of grains or other economic plants, (2) 

 weed seeds, (3) chaff, straw, etc., and (4) dirt, sand, etc. 



Weigh each portion separately and calculate the per cent in the screen- 

 ings. Identify as many of the different weed seeds as possible by comparison 

 with a standard seed collection. 



Weigh separately the weed seeds present in large numbers and calculate 

 the per cent in the screenings. 



Identify noxious and poisonous weed seeds in the sample, giving the 

 number of each, and calculate the number in one pound and one ton of the 

 screenings. 



Composition of Grain Screenings. 



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