74 ELEMENTARY AGRICULTURE 



Note the manner in which these roots grow. Which 

 are "fleshy" and good for food? Which are unsuit- 

 able for food because they are "fibrous" ? 



3. Pull up peas, beans, clover and alfalfa. Exam- 

 ine these roots for little tubercles, like tiny potatoes, 

 varying in size from a pinhead to a pea and larger. You 

 will probably find them on all of these plants. These 

 little nodules are the homes of tiny germs that feed 

 upon the nitrogen of the air. The plants in turn feed 

 upon this stored-up nitrogen. 



Problems. 



1. If corn is planted in rows four feet apart each 

 way, how many hills to the acre? With three good 

 ears to the hill, how many ears to the acre? 



2. If it takes 100 ears to make a bushel, how many 

 bushels to the acre? 



3. Which is the best crop? Five stalks to the hill 

 that bear ears requiring 200 to make a bushel, or 3 

 stalks to the hill that bear ears requiring 100 to make a 

 bushel ? 



4. How many bushels per acre is one crop better 

 than the other? 



5. Suppose a ten-acre field produces 60 bushels 

 of corn per acre the first year, but falls off 5 bushels 

 per, acre yearly when corn is continually grown on it, 

 what will be the yield the fourth year? 



.6. What will be the total loss in the four years? 

 With corn worth $0.30 per bushel, what is the money 

 loss? 



