New York Agricultural Experiment Station. 661 



amount and cost of plant-foods in tankage. 

 Of 20 samples of tankage analyzed, 16 contain both nitrogen and 

 phosphoric acid (bone and meat), while 4 contain nitrogen alone 

 (meat). The important data regarding these samples are contained 

 in the following table: 



Table VIII. — Amount and Cost of Nitrogen and Phosphoric Acid in Tankage. 



Nitrogen in meat tankage, containing no phosphoric acid, averages 

 in price about the same as in case of high-grade complete fertilizers. 

 In bone and meat tankage, the price of nitrogen averages somewhat 

 less than in case of high-grade complete fertilizers. The phosphoric 

 acid in tankage averages less than in bone-meal. 



AMOUNT AND COST OF PLANT-FOOD IN DRIED BLOOD. 



In 14 samples of dried blood the following data were obtained: 

 Table IX. — Amount and Cost of Nitrogen in Dried Blood. 



Highest. 



Lowest. 



Average. 



Pounds of nitrogen in 100 pounds 



Selling price of one ton 



Commercial valuation of one ton. 

 Cost of one pound of nitrogen . . . 



13.63 



$61.95 



61.34 



23.8 cents 



9.05 



$39.60 



40.73 



19.4 cents 



10 75 



$50.78 



48.38 



21 .6 cents 



