INSPECTION OF COMMERCIAL FERTILIZERS 7 



The fertilizer trade values adopted by the Massachusetts Fertilizer Control 

 for 1980 are based on average wholesale quotations for the six months ending 

 March 1, 1930, ])lus 20 per cent for overhead. Proper allowance was made for 

 bags, labor and freight in case of bulk quotations and for shipping points outside 

 of New England or New York. 



FERTILIZER TONNAGE. 

 Tonnage of Mixed and Unmixed Fertilizers Sold in Massachusetts. 



The tonnage of the three principal plant foods sold in Massachusetts for the 

 years 1929 and 1930 is shown in the table following: 



Plant Food Tonnage. 



Nitrogen. 



Available 

 Phosphoric Acid. 



1929. 1930. 



Potash. 



Mixed fertilizers ..... 

 Fertihzer chemicals and materials unmixed 

 Pulverized natural manures 



1,730 



1,115 



51 



1,797 



1,441 



50 



3,200 3,306 



1,737 1,630 



32 37 



2,549 

 596 



2,703 



584. 



77 



2,896 3,294 



4,975 5,039 



3,213 3,364 



There were 4,130 tons more fertilizer sold in the State in 1930 than diu-ing the 

 previous year: 32.7 i;er cent of this (1,352 tons) was mixed fertilizers, 59.6 per 

 cent (2,461 tons) was unmixed materials, and 7.7 per cent (316 tons) was pulver- 

 ized natural manures. 



Of the total tonnage, 64.4 per cent was mixed fertilizer, 31.9 per cent was 

 unmixed materials, and 3.7 per cent was pulverized natural manures. 



There were 11,697 tons of plant food sold, of which 67.2 per cent was derived 

 from mixed goods, 31.3 per cent from unmixed materials, and 1.5 per cent from 

 pulverized animal manures. The proportions of the three plant food elements 

 that were derived from mixed fertilizers and vmmixed materials were as follows: 

 nitrogen, 54.6 per cent from mixed and 43.8 per cent from unmixed materials; 

 phosphoric acid, 66.8 per cent from mixed and 32.5 per cent from unmixed mate- 

 rials; potash, 80.4 per cent from mixed and 17.4 per cent from unmixed materials. 



The tonnage of the variou,s grades of mixed fertilizer as well as the unmixed 

 materials is given in the following tables: 



