INTRODUCTION 3 



examples of this are in connection with dairy farming. The 

 following table gives the fertilizing constituents of common 

 feed stuffs and of dairy products. The value is calculated 

 on the basis of nitrogen at 20 cents per pound, and phosphoric 

 acid and potash at 6 cents per pound, which values are in 

 use at present by chemists connected with 'the inspection 

 of commercial fertilizers. 



FERTILIZING CONSTITUENTS AND VALUE AS FERTILIZERS IN 100 



POUNDS 



It will be noted that in proportion to their market value 

 dairy products take but little fertility from the farm. Wheat 

 at $1 per bushel is worth $33.32 per ton, while it carries 

 with it elements of fertility worth $ 9.59. Corn at 60 cents 

 per bushel is worth $ 21.40 per ton, while it removes fertility 



