CONTROL SERIES BULLETIN No. 12 OCTOBER, 1919 



MASSACHUSETTS AGRICULTURAL EXPERIMENT STATION 



INSPECTION OF COMMERCIAL FERTILIZERS 



By H. D. Haskins, L. S. Walker and J. B. Smith 



This bulletin gives a report in detail of the fertilizer inspection 

 for 1919. Among the more important subjects or headings are the 

 following: alphabetically arranged list of manufacturers and 

 brands; list of fertilizers registered and analyzed; fertilizer 

 sampling discussed; statement of fertilizer tonnage sold; dis- 

 cussion of fertilizer valuations; table of fertilizer trade values; 

 composition, cost and valuation of crude stock materials, includ- 

 ing a statement of commercial deficiencies. 



The composition, cost, valuation and deficiencies in mixed 

 complete fertilizers and ammoniated superphosphates are shown, 

 followed by a list of brands having a commercial shortage of over 

 $1 per ton. The quality of the plant food in mixed fertilizers is 

 discussed, and attention is called to those brands containing 

 inferior forms of organic nitrogen. Data are also presented rela- 

 tive to the composition and cost of lime compounds used for 

 agricultural purposes. The text is followed by forty-eight pages 

 of tables of analyses, giving in detail the composition, as found 

 and guaranteed, together with the commercial valuation of each 

 brand collected. 



Requests for bulletins should be addressed to the 



AGRICULTURAL EXPERIMENT STATION 



AMHERST, MASS. 



