50 CONTROL SERIES No. 95 



Colloidal Phosphate with Mineral Colloids 



This finely divided raw mineral phosphate was registered by Soil Builders, 

 Inc., Division of Colloidal Products of America, Inc., Orlando, Florida. It 

 analyzed as follows: 



Moisture. ...... 



Total phosphoric acid . 



Phosphoric acid dissolved by neutral citrate 



of ammonia (so-called available phosphoric 



acid) 4.43 



Phosphoric acid insoluble in neutral citrate of 



ammonia ...... 18.72 



We believe that the evaluation of this product should depend largely upon the 

 effectiveness of its phosphoric acid in growing crops. Vegetation experiments 

 show but little difference between this product and finely ground Tennessee rock 

 phosphate, so far as availability of the phosphoric acid is concerned. Tennessee 

 rock phosphate containing 72 percent bone phosphate of lime (32.95 percent 

 P 2 5 ) was quoted in both the Oil, Paint & Drug Reporter and Chemical Markets 

 & Chemical Industries at $4.50 per ton in bulk at the mines. An allowance of 

 20 percent overhead, $5.00 for freight, and $1.50 for bags, would bring the cost 

 at northern points of distribution to $11.90 per ton, or 36 cents per unit of P 2 5 . 

 At this rate the Colloidal Phosphate with Mineral Colloids, analyzing 23.15 

 percent phosphoric acid, should sell at northern points for $8.33 a ton. Two of 

 the four lots sampled by our inspectors were being sold at $32.00 a ton, which is 

 more than the average cash cost of a ton of 3-10-6 commercial fertilizer during 

 1938. 



Mender th 



Note: Commercial valuation per ton not over $1.50. 



DIRECTORY OF MANUFACTURERS WHO REGISTERED FERTILIZER FOR SALE 

 IN MASSACHUSETTS IN 1938. 



Acme Guano Co., 416 Munsey Bldg., Baltimore, Md. 



Agricultural Laboratories, Inc., 3415 Milton Ave., Columbus, Ohio. 



American Agricultural Chemical Co., 285 River St., North Weymouth, Mass. 



American Cyanamid Co., 30 Rockefeller Plaza, New York, N. Y. 



Apothecaries Hall Co., Benedict St., Waterbury, Conn. 



Armour Fertilizer Works, 120 Broadway, New York, N. Y. 



Ashcraft-Wilkinson Co., Atlanta, Ga. 



Atkins & Durbrow, Inc., 165 John St., New York, N. Y. 



Ernest J. Bantle, Glastonbury, Conn. 



Barrett Co., 40 Rector St., New York, N. Y. 



F. A. Bartlett Tree Expert Co., 60 Canal St., Stamford, Conn. 



Belmont Gardens, 170 Brighton St., Belmont, Mass. 



Berkshire Chemical Co., Bridgeport, Conn. 



Bisbee Linseed Co., Inc., 1 46 Cnurch St., Amsterdam, N. Y. 



Bisbee Linseed Co., 2100 Lincoln Liberty Bldg., Philadelphia, Penn. 



