FERTILIZERS 155 



2. How much of each of the above in 15 loads? 20 

 loads? 50 loads? 



3. How many loads of manure were hauled onto 

 your land last year? How much of each fertilizing 

 substance was supplied ? 



4. If you put 15 loads on an acre, how much of 

 each fertilizing substance per acre ? 



5. Suppose you harvested 50 bu. of corn per acre. 

 How much of each fertilizing substance did you take 

 off with the crop ? 



6. Was your soil richer or poorer after the corn 

 was harvested? Did you take off more than you put 

 on ? How much of each kind ? 



7. How much of each of these fertilizing substances 

 is taken off with a 25 bu. crop per acre of wheat ? A 40 

 bu. crop of barley ? 



8. How many loads of manure per acre are necessary 

 to restore the fertility lost when a 25 bu. per acre wheat 

 crop is harvested? 



9. If $5 per acre spent in fertilizer increases the 

 yield of potatoes 50 bu. net. Find the gain per acre by 

 fertilizing. 



10. A farmer who uses fertilizer costing $6 an acre 

 grows 560 Ibs. of cotton per acre; one who uses no 

 fertilizer grows 350 Ibs. per acre. At the present mar- 

 ket price of cotton which plan is the more profitable? 

 How much is gained on 80 acres? 



11. The usual prices of the common fertilizers is as 

 follows : 



Nitrate of soda, $57.00 per ton. 



