CONTROL SERIES BULLETIN No. 37 NOVEMBER, 1926 



MASSACHUSETTS AGRICULTURAL EXPERIMENT STATION 



INSPECTION OF COMMERCIAL FERTILIZERS 



By H. D. Haskins, L. S. Walker and M. W. Goodwin 



This publication is the fifty-third report of the fertilizer 

 inspection work in Massachusetts. A study of the figures ob- 

 tained shows that slightly less than half the brands analyzed 

 met their guarantees in every particular, — a percentage sig- 

 nificantly lower than last year. This is accounted for in part 

 by the fact that manufacturers allowed a smaller margin of 

 overruns in nitrogen, phosphoric acid and potash. The situa- 

 tion calls for closer chemical control of raw materials on the 

 part of manufacturers. A gratifying improvement over last 

 year is noted in the quality of the organic nitrogen used in fer- 

 tilizer mixtures. The tonnage figures show a slight decline in 

 the use of the ** New England Standard Nine " grades of mixed 

 fertilizer, as compared with last year. 



Requests for bulletins should be addressed to the 



AGRICULTURAL EXPERIMENT STATION 

 AMHERST. MASS. 



Publication- ok this Document approved by the Commission on Administration and Finance 

 3M ll-'26 Order 7186. 



