22 ELEMENTARY AGRICULTURE 



yard? Per square rod? How many cubic feet per 

 square rod ? Per acre ? 



2. About how many barrels of water fall on an 

 acre with i inch rainfall? 



3. How many tons will this water weigh? 



4. The total rainfall during the year in Wisconsin 

 is about four feet. What does the water weigh that 

 falls during the year on a square yard of ground ? On 

 a square rod ? How many tons to the acre ? 



5. Suppose the plants use one-eighth of this, what 

 is the weight of the water used by a square yard of 

 vegetation ? A square rod ? An acre ? 



6. Suppose potatoes contain three-fourths of their 

 weight of water. How many pounds of water in a 

 bushel of potatoes ? 



7. If 150 bushels per acre of potatoes is a good 

 yield, how many pounds of water in the potatoes 

 grown on an acre ? 



8. By the aid of data furnished by the members 

 of the class make and solve at least ten other similar 

 problems. 



