98 FARM ARITHMETIC. 



by an experiment made at one of Our experiment stations, 

 as follows: 



UNPROTECTED MANURE VERSUS PROTECTED MANURE. 



282. How many tons increase in yield of corn from 

 land fertilized with stable manure which has been pro- 

 tected from rain and wash? 



283. What is the percentage increase secured by pro- 

 tection of manure from rain and wash ? 



$2.15 



Manure exposed in yard. 

 $2.96 



Stall manure. 



$480 



Stall manure and acid phosphate. 



INCREASING VALUE OF MANURE. 



When stable manure is treated with acid phosphate and kept under cover its 

 fertilizing value is increased. 



