Composition of Different Grades of Fertilizers. 



Low-grade 



Medium-grade 



Medium high-grade 

 High-grade 



Nitrogen. 



Available 



Phosphoric 



Acid. 



7 



5 5 

 3-5 



Potash. 



2 

 2 



2-5 



1.8 



Food for 

 Plants 



221 



Cost of One Pound of Plant-Food in Different Grades of Fertilizers. 



Cost of one pound of Nitrogen. 



Lowest 



Highest 



Average 



Cost of one pound of Available Phos 

 phone Acid. 



Lowest 



Highest 



Average 



Cost of one pound of Potash. 



Lowest 



Highest 



Average 



High 

 Grade 



Cents. 



26.0 

 19.6 



425 



7-9 

 6.0 



3-4 

 6.7 



50 



From these data, we readily see the truth of the following 

 statements: 



1. The cost of one pound of plant-food, whether Nitrogen, 

 phosphoric acid or potash, is greatest in low-grade, and least 

 in high-grade, fertilizers. One purchaser of low-grade 

 goods paid 36.8 cents a pound for Nitrogen, while the highest 

 price paid in high-grade goods was 26 cents, which is less 

 than the average paid for Nitrogen in low-grade goods. 

 The least amount paid for one pound of Nitrogen in low- 

 grade goods was 20 cents, in high-grade goods 13.3 cents. 

 Similar relations hold good in respect to the other elements 

 of plant-food. 



2. In general, the higher the grade of goods, the lower 

 the cost of each pound of plant-food. 



