CONTROL SERIES. BULLETIN NO. 8. DECEMBER, 1917 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



INSPECTION OF 



Commercial Fertilizers 



BY 



H. D. HASKINS, L. S. WALKER, W. A. ALLEN 



and R. S. SCULL. 



In this bulletin will be found the results of the fertilizer 

 inspection for 1917. The first portion of the bulletin records 

 the names of the 100 manufacturers, and of each of the 512 

 brands registered. Following this is a brief description of the 

 method of sampling, number of sacks sampled and of analyses 

 made. A table shows the wholesale ton quotations for the six 

 months preceding March 1, of raw materials and chemicals, 

 and also the retail prices at which such materials were offered 

 by manufacturers. 



The chemical character of the raw materials, as well as 

 of mixed fertilizers and superphosphates, is discussed, and 

 mention is made of the firms whose products fell below the 

 guarantee. 



The quality of the nitrogen, phosphoric acid and potash 

 contained in fertilizer mixtures is explained, and particular 

 attention is called to those brands containing an inferior grade 

 of organic nitrogen. 



Some forty pages of the bulletin are devoted to the tables 

 of analyses, showing in detail the exact composition of each 

 brand found on sale in this State, 



Requests for bulletins should be addressed to the 



AGRICULTURAL EXPERIMENT STATION, 



AMHERST, MASS. 



