STONE AND CEMENT CONSTRUCTION. 495 



how many acres of corn yielding 100 bushels per acre will be required 

 to fill it. 



4. If the value of corn silage is estimated at $3 per ton, what will 

 be the difference between the value of 7 acres of corn that will yield 40 

 bushels of corn per acre at the present market price or if made into 

 silage worth $3 per ton, allowing $35 for value of fodder if the corn is cut 

 and husked? 



5. A field of corn will yield 50 bushels per acre or make 10 tons 

 of silage per acre; if the price of corn is 50c per bushel, and silage is 

 valued at the rate of -two and one-half tons of silage equal in price to one 

 ton of timothy; what is the difference in value between the silage and 

 grain when timothy is selling for $12 a ton? 



Cost of Harvesting and Filling. 



Investigations made by the government including work done 

 upon thirty-one farms in Michigan and Wisconsin showed the 

 following to be the average cost for filling the Silo : 



Laborers, per hour 15c 



A team, per hour 15c 



Engine, per day 4.50 



Twine, per pound 15c 



Coal, per ton 5.00 



Gasoline, per gallon 13c 



This investigation showed that the cost per ton for filling 

 silos varied from 46 to 86 cents. 



Another investigation with 87 silos in various parts of the 

 United States showed that the average cost of filling was 87 

 cents per ton. 



An investigation into the cost of growing an acre of corn 

 for ensilage for filling 87 silos showed an average cost of $1.58 

 per ton. 



PROBLEMS. 



1 . According to the findings of the government, what was the 

 average cost of ensilage per ton in the 87 cases investigated? 



2. If one ton of timothy is equal in feeding value to two and 

 one-half tons of ensilage; when timothy is selling for $10 per ton and the 

 expense for making the hay is $1.00 per ton ; which is the cheaper for 

 feeding purposes, hay or ensilage? 



