MANURE FROM DIFFERENT FOODS. 



139 



part, I want to make all the manure I can, and to buy all the 

 artificial manure my purse will warrant, always provided it is 

 of good quality and sold at a reasonable rate. I think we 

 shall use more and more artificial manures every year. Still, 

 I think it can be shown that we can get nitrogen, phosphoric 

 acid and potash, by feeding animals, at a much cheaper rate 

 than in artificial manures. The only reason why we can afford 

 to use the artificial fertilizers is, that the nitrogen and phos- 

 phoric acid are in a more available condition. 



Professor S. W. Johnson, after a thorough examination of 

 the subject, estimates the nitrogen in artificial manures as 

 worth thirty cents a pound, potash seven cents a pound, solu- 

 ble phosphoric acid sixteen and a quarter cents, and insoluble 

 phosphoric acid six cents a pound. If we estimate that the 

 animal takes out ten per cent. Of the nitrogen, and that we 

 lose seven per cent, from leaking, evaporation, etc., we shall 

 have twenty-five cents' worth of nitrogen in the manure for 

 every thirty cents' worth in the food. 



A ton of corn-meal contains thirty-six pounds of nitrogen, 

 and consequently we should have nine dollars' worth of nitro- 

 gen in the manure. 



The ton of corn-meal also contains seven pounds of potash, 

 worth seven cents a pound, or forty-nine cents. It also con- 

 tains phosphoric acid equal to twenty-two and u half pounds 

 of phosphate of lime, which we will consider worth six cents 

 a pound, or $1.35. The total value of the manure obtained 

 from the consumption of a ton of corn, therefore, is $10.75. 

 On the same basis, — 



