CONTROL SERIES BULLETIN No. 16 NOVEMBER, 1921 



MASSACHUSEHS AGRICULTURAL EXPERIMENT STATION 



INSPECTION OF COMMERCIAL FERTILIZERS 



By H. D. Haskins, L. S. Walker and R. W. Swift 



During the year ending July 1, 1921, Massachusetts farmers 

 purchased 61,013 tons of commercial fertilizer at an estimated cost 

 of $3,580,000. Mixed complete fertilizers and ammoniated mixtures 

 made up nearly two-thirds of this total; unmixed materials, one- 

 third. This bulletin reports the results of chemical control work 

 carried on by the State for the purpose of insuring that fertilizers 

 sold to her farmers are what they are claimed to be. During the 

 season 7,000 quantitative determinations have been made, repre- 

 senting 544 brands, 47 of which showed a commercial shortage 

 of more than $1 per ton. The cost of this protective work was 

 approximately one-third of one per cent of the selling price of 

 the product. 



Requests for bulletins should be addressed to the 



AGRICULTURAL EXPERIMENT STATION 

 AMHERST. MASS. 



