COMPAEATIVE VALUE OF MANURES 49 



7. What is the value of the plant food in the cornstalks 

 from 1 A., when the stalks weigh 3500 Ib. ? 



8. It is estimated that a 1000-pound steer during the 

 process of fattening makes .9 ton of manure per month. 

 What is the value of the manure from a herd of 20 for 

 3 mo. ? 



9. It is estimated that the value of the manure produced 

 annually by a farm horse is $30 ; that produced by the cow, 



BARN WHERE THE MANURE IS WASHED AWAY 



$24 ; and that produced by the hog, $10. If the statement 

 is true that the average farmer saves only ^ of the value of 

 the manure on the farm, what is the annual loss on 2 horses, 

 3 cows, and 5 hogs ? 



THE COMPARATIVE VALUE OF MANURES 



57. The table on the following page gives the analysis of 

 farmyard manures made by the Department of Agriculture 

 at Washington, D.C. 



58. When nitrogen is worth 20$ per pound, potash 6$, 

 and phosphoric acid 5$, complete the table by estimating 

 the value of each ton of manure. 



