A ton of drainage from gutter behind milk cows contains- 



20 pounds of nitrogen 



5 pounds of phosphoric acid 

 17 pounds of potash 



Drainage from a manure heap per ton contains— 

 30 pounds of nitrogen _ 

 2 pounds of phosphoric acid 

 98 pounds of potash 



Field of Alfalfa on the Deere Midvale Farm 



Composition of Farm Manure 



Barnyard manure is composed of excrements, urine and Htter. The 

 amount of plant food in a ton depends upon the amount of water it con- 

 tains, the kind of litter used, the feed given the animal and the kind of 

 animal. Average barnyard manure contains per ton — 



10 pounds of nitrogen 



From 6 to 7 pounds of phosphoric acid 



From 12 to 16 pounds of potash 



