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? 



12.15 



$2.96 



$480 



Manure exposed in yard. 



Stall manure. 



Stall manure and acid phosphate. 

 Increasing Value of Manure. 



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

 fertilizing value is increased. 



