FARM MANURES 1 89 



FARM No. 2 



IN 10 TONS MIXED FEED 

 Lbs. 



Nitrogen . 400 



Phosphoric acid 240 



Potash 300 



Loss, SOLD IN MILK AND RETAINED IN BODY 

 Lbs. Per Cent 



Nitrogen, 400 x 0.20 80 20 



Phosphoric acid, estimated . . . 10 4 



Potash 12 4 



PRESENT IN FINAL PRODUCT 



MANURE FROM i TON FEED 



Lbs. 



Nitrogen 32.0 



Phosphoric acid 23.0 



Potash 29.0 



Relative money value $3-8o 



213. Summary of Ways in which Stable Manure 

 may be Beneficial. - - Farm manures act upon soils 

 chemically, physically, and bacteriologically. 



(a) Chemically : 



1. By adding new stores of plant food to the soil. 



2. By combining with the soil, forming humates, and 

 rendering the inert mineral plant food more available. 



3. By raising the temperature of the soil, as the re- 

 sult of oxidation. 



(b) Physically : 



1. By making the soil darker colored. 



2. By enabling soils to retain more water and to give 

 it up gradually to growing crops. 



