CONTROL SERIES BULLETIN No. 14 DECEMBER, 1920 



MASSACHUSETTS AGRICULTURAL EXPERIMENT STATION 



INSPECTION OF COMMERCIAL FERTILIZERS 



By H. D. Haskins, L. S. Walker and A. M. Clarke 



This bulletin gives a report in detail of the fertilizer inspection 

 for 1920. The following phases of the subject are discussed : manu- 

 facturers and brands; the collection of fertilizers; tonnage of fer- 

 tilizers; fertilizer valuations; general information w^ith regard to 

 chemicals and raw products, mixed complete fertilizers, and ammoni- 

 ated superphosphates; quality of plant food in complete fertilizers 

 and ammoniated superphosphates; brands of mixed fertilizer show- 

 ing inferior forms of nitrogen; the grades of mixed fertilizers sold 

 in Massachusetts; the economical purchase of commercial fertil- 

 izers; lime compounds. The text is followed by detailed tables of 

 analyses showing the composition as found and as guaranteed, to- 

 gether with the commercial valuation of each brand analyzed. 



Requests for bulletins should be addressed to the 



AGRICULTURAL EXPERIMENT STATION 

 AMHERST. MASS. 



