36 FARM ARITHMETIC. 



this year at one cent a pound, or 56 cents a bushel. Of 

 the total (estimated) crop in the United States (3 billion 

 bushels) ? Of a 10-acre piece which yields an average 

 of 32^ bushels per acre? 



2. Figuring the cost per pound as stated above, how 

 much would it cost to buy the nitrogen contained in the 

 10-acre piece? Take both the grain and stover into con- 

 sideration, estimating 2.86 pounds of stover to each 

 pound of grain. What is the value of the phosphoric 

 acid taken from the 10-acre piece? Of the potash? Of 

 the three together? Compare this with the value of the 

 grain. 



3. Find the cost of the nitrogen of the phosphoric 

 acid, of the potash, and of all together in the total corn 

 crop of the United States and of your own farm. 



ANSWERS TO ABOVE QUESTIONS. 



1. The value of the total United States crop of 3,000,- 

 000,000 bushels of corn at 56 cents per bushel is $1,680,- 

 000,000. The value of 325 bushels raised on 10 acres is 

 $182. 



2. The nitrogen in the grain and stalks together at 20 

 cents a pound would cost $172.90, the phosphoric acid 

 at 5 cents a pound 14.30, the potash at 4 cents a pound, 

 $31.72; total, 218.92. Now, as a matter of fact, not 

 all of this has to be bought, for corn is able to get most 

 of its food from the soil. 



3. Value of the elements in the big total crop of corn 

 in the United States, nitrogen $1,597,000,000, phosphoric 

 acid, $132,075,000; potash, $293,080,000; total, $2,022,- 

 080,000. 



The Value of Corn Stover. The stover produced on 

 an acre of corn is worth about as much as the hay from 



