DEPARTMENT OF CHEMISTRY. 



J. B. LiNDSEY, Chemist. 



INSPECTION OF COMMERCIAL FERTILIZERS 

 FOR THE SEASON OF 1921. 



BY H. D. HASKINS, CHEMIST IN CHARGE, ASSISTED BY L. S. WALKER AND 

 RAYMOND W. SWIFT. ^ 



MANUFACTURERS AND BRANDS. 



During the season of 1921, 87 manufacturers, importers and dealers, including the 

 various branches or subsidiaries of the larger companies, have secured certificates for 

 the sale of 548 brands of fertilizer and fertilizing materials in the markets of Massa- 

 chusetts. They may be classed as follows : — 



Complete fertilizers .... 

 Pulverized manures .... 

 Ammoniated superphosphates 

 Superphosphate and potash 

 Ground bone, tankage and dry ground fish 

 Wood ashes ..... 

 Chemicals and organic nitrogen compounds 



300 



10 



49 



7 



55 



3 



124 



548 



A few of the registered brands were not collected. In some cases this was due to 

 the fact that no sales were made; in others, that but a small tonnage was sold and 

 this was apphed to the soil before the collectors were able to secure samples. The 

 following registered brands were not sampled : — 



1 L. F. Pratt assisted in the phosphoric acid laboratory two and one-half months, and Miss E. M. Bradley in 

 the nitrogen laboratory one month. 



