FERTILIZERS. 



After the original chart arranged by Director J. L. Hills, of the 



Vermont Experiment Station, for the U. S. Government 



Fertilizer Exhibit at the St. Louis Exposition. 



Average cost of a pound of plant food in "low," 

 "medium" and "high" grade "complete fertilizers" 

 (Vermont, 1903). 



The Nitrogen Cost per Ib. 



= $102 a Ton for 

 Nitrate of Soda. 



= $80 a Ton for 

 Nitrate of Soda. 



= $71 a Ton for 

 Nitrate of Soda. 



The Nitrogen in Nitrate of Soda, in 1903, cost 15 cents per Ib. 

 The Available Phosphoric Acid Cost per Ib. 



in low grade, 

 in medium grade, 

 in high grade. 



The Phosphoric Acid in Acid Phosphate, in 1903, cost 4K cents per Ib. 

 The Actual Potash Cost per Ib. 



in low grade, 

 in medium grade, 

 in high grade. 



Food for 

 Plants 



233 



The Actual Potash in Sulphate of Potash, in 1903, cost 5 cents per Ib. 



