INSPECTION OF COMMERCIAL FERTILIZERS 

 Mixing Efficiency Table 



Manufacturer 



Acme Guano Co. . 

 American Agricultural Chemical Co. 

 Apothecaries Hall Co. 

 Armour Fertilizer Works 

 Berkshire Chemical Co. 

 Consolidated Rendering Co. . 

 Eastern States Farmers' Exchange 

 International Agricultural Corp. . 

 Miller Chemical & Fertilizer Corp. 

 Old Deerfield Fertilizer Co., Inc. . 

 Olds & Whipple, Inc. 

 Rogers & Hubbard Co. . 

 Standard Wholesale Phosphate & 



Works, Inc 



Swift & Company Fertilizer Works 

 Woodruff Fertilizer Works, Inc. 



Acid 



Average Percentage of Plant Food Above or 

 Below the Minimum Guarantee 



Nitrogen 



-.006 

 -.01 

 + .24 

 -.18 

 -.007 

 + .07 

 + .23 

 -.07 

 -.12 

 + .30 

 +.14 

 +.18 



+.09 

 + .16 

 +.07 



Available 

 Phosphoric Acid 



+.23 

 +.26 

 +.47 

 +.41 

 +.35 

 + .25 

 + .02 

 + .41 

 +.20 

 + .82 

 + .65 

 +.55 



+ .19 

 +.31 

 +.12 



Potash 



+.59 

 +.14 

 + .27 

 +.19 

 +.03 

 + .33 

 +.72 

 +.11 

 +.22 

 + .74 

 +.67 

 +.37 



+ .41 

 +.19 

 +.14 



Summary of Data on Acid and Basic Fertilizers 



* The net acidity is the total amount of calcium carbonate, expressed in tons, which would be 

 required to neutralize all the fertilizer tested. 



The average acidity is the average amount of calcium carbonate, expressed in pounds, which 

 would have to be added to each ton of mixed fertilizer to make neutral all of the fertilizer tested. 



* Does not include fertilizer mixed for special orders. 



During the past five years, the average guarantee of the mixed fertilizers has 

 been higher each year than the preceding year, with the exception of the average 

 guaranteed available phosphoric acid which was slightly lower in 1937. Since 

 1935 the increase in guaranteed percentage of plant food has been: nitrogen .39; 

 available phosphoric acid .39; potash .69. 



