12 



CONTROL SERIES NO. 154 



PHOSPHORIC ACID COMPOUNDS 



Manufacturer and Brand 



American Agricultural Chemical Co. 



AA Quality Phosphate Rock 



18% Normal Superphosphate. . . . 



Armour Fertilizer Works 



Armour's Big Crop Superphosphate 20% 



Consolidated Rendering Co. 



Corenco Superphosphate 20% 



Davison Chemical Corp. 



Davco Granulated 20% Superphosphate. 



Eastern States Farmers' Exchange, Inc. 



Eastern States Superphosphate 20%. . . 



Farm Bureau Association 



Farm Bureau Superphosphate 20% 



Fox Point Chemical Co. 



Old Fo.x Brand Superphosphate 20%. . , 



International Minerals & Chemical Corp. 



International Superphosphate 20%. . . , 



Old Deerfield Fertilizer Co., Inc. 



Old Deerfield Superphosphate 20% . 



Rogers & Hubbard Co. 



Hubbard Superphosphate 20% 



Ruhm Phosphate & Chemical Co. 



Red Seal Brand "Ruhm's" Phosphate Rock. 



a Guaranteed 30% total phosphoric acid. 

 b Composite of 6 samples. 



Total 

 Phos- 

 phoric 

 Acid 



31.82a 

 118.93 

 ^20.05 



118.87 



21.686 



/20.81 

 121.17 



20.91 



POTASH COMPOUNDS 

 Muriate of Potash 



Available 

 Phosphoric Acid 



Found 



18.05 

 19.03 

 18.29 



21.09 



20.61 

 21.07 



21.14 



Guaran- 

 teed 



18.00 

 18.00 

 18.00 



20.00 

 20.00 

 20.00 

 20.00 

 20.00 

 20.00 



20.00 

 20.00 



20,00 

 20.00 



Manufacturer 



Water Soluble Potash 



Found 



Guaran- 

 teed 



American Agricultural Chemical Co 



Consolidated Rendering Co 



Davison Chemical Corp 



Eastern States Farmers' Exchange, Inc.. 

 International Minerals & Chemical Corp. 



Old Deerfield Fertilizer Co., Inc 



58.06 



61.45 



50.05 



61.04 



/60.86 

 \60.82 



58.00 



60.00 



50.00 



60.00 



60.00 

 60.00 



60.00 



