660 



Report on Inspection Work of the 



Table VI. — Amount and Cost of Phosphoric Acid in Acid Phosphate. 



These figures show that, on an average, the available phosphoric 

 acid costs less in the form of acid phosphate than in mixtures. It is 

 difficult to conceive of conditions that would justify such an excessive 

 price as $22 a ton for acid phosphate. It is obvious that the selling 

 price varies much more than is justified by the variation of composi- 

 tions. 



amount and cost of plant-foods in bone-meal. 



The following table gives the essential data in the case of 34 samples 

 of bone-meal, collected in this State during the spring and summer of 

 1914. 



Table VII. — Amount and Cost of Nitrogen and Phosphoric Acid in 



Bone-Meals. 



The cost of nitrogen in bone-meal is about the same as in high-grade 

 complete fertilizers. The cost of phosphoric acid is less than in com- 

 plete fertilizers, even high-grade, and somewhat less than in acid 

 phosphates, but it must be remembered that the phosphoric acid in 

 bone-meals is considerably less quickly available than in the form of 

 dissolved rock. When moderately slow action of phosphoric acid is 

 desired, bone-meal may answer the purpose, but for rapid action one 

 should use only forms that are readily soluble. 



