CONTROL SERIES No. 51 



BRIEF SYNOPSIS OF THE FIFTY-SIXTH REPORT OF 

 MASSACHUSETTS FERTILIZER CONTROL 



Brands registered and sampled. 



Prices of crude stock fertilizer materials. 



Fertilizer valuations. 



Tonnage of fertilizers and plant food sold. 



New England Standard Nine and their relation to tonnage sold. 



Deficiency statistics as applied to each manufacturer. 



Mixing efficiency table as appUed to the larger firms. 



Table showing composition of 19 samples of mixed fertilizer having commercial 



shortage of over $1 per ton and involving 7 manufacturers. 

 Table showing composition of mixed fertilizers substantially complying with 



guarantees. 

 Detailed analyses of unmixed materials which include 20 analyses of a variety of 



substances found deficient more than $1 per ton. 

 Definitions and interpretations relating to fertiUzers. 

 Vegetation pot experiment on 19 organic nitrogen substances including all of the 



processed low grade nitrogen materials that could be secured through trade 



channels. 

 Directory of Manufacturers. 



