EXERCISE 26. STUDY OF A HEAD OF WHEAT 



Equipment: A sufficient number of wheat heads to 

 supply eacli member of the class with a head of bearded and 

 one of smooth wheat. 



Method : Make a careful examination of the two heads 

 and locate all of the parts. Make a drawing of the entire 

 spike, then separate the parts and make a detailed sketch 

 showing each part in place- Remove a kernel from one of 

 the spikelets and make a drawing showing the crease side, 

 the germ side, and a cross-section view. All drawings 

 should be at least one inch in height. 



After the detailed study is finished, fill out the following 

 table with data obtained by the examination of five average- 

 size heads. 



How many average-size heads must there be per acre to 

 give a yield of 20 bushels of threshed grain? 



Thresh by hand 100 average heads and weigh the 

 threshed grain. 



Discussion : The head of wheat is called a spike, and is 

 composed of spikelets arranged to alternate on two sides of a 



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