CROPS AND SOIL^ IMPROVEMENT 



is estimated, the total product of manure in tons 

 can be arrived at with fair accuracy. 



Analysis of Manure. As has been stated, 

 the content of the manure must depend chiefly 

 upon the character of the feed. We are accus- 

 tomed to combine feeding stuffs in differing propor- 

 tions for horses, cows, pigs, and sheep. Van Slyke 

 names the following approximate percentages of 

 plant-food constituents in fresh excrements of 

 farm animals, the solid and liquid being mixed: 



He estimates that one ton of average mixed 

 stable manure, inclusive of absorbents, contains 

 approximately 10 pounds of nitrogen, 5 pounds 

 of phosphoric acid, and 10 pounds of potash. 



[128] 



