SYNOPSIS OF THE FIFTY-SEVENTH REPORT OF 

 MASSACHUSETTS FERTILIZER CONTROL 



Brands registered and sampled. 



Prices of crude stock fertilizer materials. 



Fertilizer trade values. 



Tonnage of fertilizers and plant food sold. 



"New England Standard Nine" grades and their relation to tonnage sold. 



Deficiency statistics as applied to each manufacturer. 



Mixing efficiency table as applied to the larger firms. 



Table showing composition of 4 samples of mixed fertilizer having commercial 

 shortage of over $1 per ton and involving 3 manufacturers. 



Table showing composition of mixed fertilizers substantially complying with 

 guarantees. 



Tables giving detailed analyses of unmixed materials, including 12 analyses of a 

 variety of substances with a commercial shortage of more than $1 per ton. 



Definitions and interpretations relating to fertilizers. 



Vegetation pot experiment to study the nitrogen availability of 22 organic nitro- 

 gen substances. 



Vegetation pot experiment to note the effect of manganese sulfate on yield of crop. 



Vegetation pot experiment to study the phosplioric acid availability of IS phos- 

 phates. 



Directory of manufacturers. 



