62 FOOD FOR PLANTS 



Pounds per Acre of Essential Fertilizer Ingredients 



Added to the Soil in the Fertilizers Used. 



1919. 



The profit per acre as between the application of 

 400 pounds of acid phosphate alone, and of Nitrate 

 and acid phosphate together shows that the added 

 investment in 400 pounds of Nitrate, which may be 

 estimated at practically fourteen dollars ($14), gave 

 a rate of profit of twenty dollars ($20) per acre, valu- 

 ing ensilage at present at five dollars ($5) a ton. 



Since the rate of yield per acre of the Nitrate and 

 acid phosphate plot was 20.9 tons as against a rate 

 of yield per acre of 14.1 tons for the acid phosphate 

 alone plot, — the value in the first case is placed at 

 one hundred four dollars and fifty cents ($104.50) 

 per acre, and in the latter case at seventy dollars and 

 fifty cents ($70.50) per acre. As the crop increase 

 from the use of 400 pounds of Nitrate is valued at 

 thirty-four dollars ($34), and the cost of the Nitrate 

 at fourteen dollars ($14), a profit at the rate of 

 twenty dollars ($20) per acre is the result, as above 

 stated. 



These figures are in general in close agreement 



