INSPECTION OF COMMERCIAL FERTILIZERS 

 FOR THE SEASON OF 1937 



By H. D. Haskins, Official Chemist' 



CONTENTS 1 



Page I 



Manufacturers and brands 2 ' ■ 



Comparative cost of fertilizer chemicals and unmixed fertilizer products 3 



Fertilizer trade values . . 4 



Fertilizer tonnage 5 



Plant food tonnage ......... ... .5 



"New England Standard Nine" grades 7 



Mixed fertilizers 9 



Deficiency statistics ... 9 



Mixing efficiency table .11 



Acid and basic fertilizers 11 



Average analysis of mixed fertilizers 11 



Mixtvres showing a commercial shortage of $1 or more per ton 13 



Mixtures substantially complying with guarantees 14 ' ' 



Chemicals and raw products 32 ;^'l 



Summary of results of the inspection 32 <'i^\ 



Nitrogen compounds ^^ i* 



Phosphoric acid compounds 37 f 



Potash compounds 37 



Products supplying nitrogen and phosphoric acid 38 



Pulverized animal manures 41 



Miscellaneous 43 ,' 



Colloidal Phosphate with Mineral Colloids 45 



Directory of manufacturers who registered fertilizers for sale in Massachusetts in 1937 . 47 



MANUFACTURERS AND BRANDS 



Registrations have been perfected in Massachusetts during 1937 by 94 firms, 

 covering 497 brands of mixed fertilizer and unmixed fertilizing materials. The 

 nature of these products is shown by the following classification: 



Complete fertilizers 303 



Ammoniated superphosphates 3 



Superphosphates with potash 1 



Dry ground fish, tankage and ground bone .... 45 



Fertilizer simples, including organic nitrogen compounds 96 



Tobacco stems 1 



Pulverized manures 32 



Cotton hull ashes and wood ashes 7 



Peat products 3 



Stone meal 1 



Nitrate of potash 5 



Total 497 



JAssisted by H. Robert DeRose, John W. Kuzmeski, Albert F. Spelman, Stuart P. Stiles, Chem- 

 ists; Louis A. Graves, C. L. Whiting, G. E. Taylor, Sampling Agents; Harry L. Allen, Laboratory 

 Assistant; Cora B. Grover, Clerk. 



