INSPECTION OF COMMERCIAL FERTILIZERS 

 Mixing Efficiency Table. 



If 



Mantjfacttjeeb. 



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 & Acid Works, 



Inc. . . 



Woodruff Fertilizer Works, Inc. 



Average Percentage of Plant Food Above or 

 Below the Minimum Guarantee. 



Nitrogen. 



+.16 

 +.21 

 +.52 

 +.09 

 +.10 

 +.10 

 +.34 

 + .11 

 —.10 

 +.44 

 +.41 

 +.55 

 + .14 



+.10 



Available 

 Phosphoric Acid. 



—.07 

 —.003 



+.7S 

 +.22 

 +.32 

 +.17 

 +.52 

 +.21 

 +.16 

 +.92 

 + .46 

 +.42 

 +.63 



+.88 



Potash. 



+.01 

 +.21 

 +.39 

 +23 

 +.27 

 +.18 

 +.70 

 +.21 

 +.32 

 +.85 

 +1.11 

 +.48 

 +.36 



+.54 



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. 



AVERAGE ANALYSIS OF MIXED FERTILIZERS* 



♦Does not include fertilizer mixed for special orders. 



During the past four 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. 



