INSPECTION OF COMMERCIAL FERTILIZERS 63 



3. With three or four exceptions, the phosphates in Series II, with the op- 

 timum amount of i)hosphoric acid, gave a larger yield of both dry matter and 

 phosphoric acid than was secured in Series I. These exceptions which indicate a 

 depression in yield may or may not be significant. It will be interesting to note 

 if the same conditions exist in 1931, when it is hoped that the experiment may be 

 continued. 



In Series II, five of the phosphates led 16% Superphosphate in yield of dry 

 matter, and ten led in phosphoric acid recovered. The two raw mineral phos- 

 ]ihates. Colloidal Phosphate and Finely Ground Rock Phosphate, showed an 

 average availability of about 18 based on dry matter yield, and about 37 based on 

 recovery of phosjihoric acid, as compared with Superphosphate at 100. 



The Low Fluorine Phosphate, High Grade Residue By-Product, and Reform 

 Phosphate, next to Colloidal Phosphate, Finely Groimd Rock Phosphate, and 

 Ober Residue B, gave the lowest availability based botli on dry matter yield (70 

 to 80) and on phosphoric acid recovery (76 to 95). 



4. In Series III, where double the optimum amount of phosjjhoric acid was 

 used. Colloidal Phosphate was rated 63 and 61, and Phosphate Rock 28 and 45 for 

 availability based on dry matter yield and on phosphoric acid recovery, as com- 

 l)ared with Superphosphate at 100. Note the depression in yield of dry matter 

 with this large application of phosphoric acid from Superphosphate, and the same 

 phenomenon in case of the increased amounts of nitrogen and potash. 



The accompanying photographs show the healthy ajipearance of the crop just 

 jjrevious to harvesting. They also confirm in a general way the differences noted 

 in dry matter yields. 



DIRECTORY OF MANUFACTURERS WHO REGISTERED FERTILI- 

 ZERS FOR SALE IN MASSACHUSETTS IN 1930. 



American Agricultural Chemical Co., 89 Broad St., Boston, Mass. 



American Cyanamid Co. 535 Fifth Ave., New York, N. Y. 



American Soda Products Co., 121 East Oak Ave., Moorestown, N. .P. 



Anglo-Chilean Nitrate Sales Corp., 120 Broadway, New York, N. Y. 



Apothecaries Hall Co., 24 Benedict St., Waterbury, Conn. 



Archer-Daniels-Midland Co., Minneapolis, Minn. 



Armour Fertilizer Works, 10 East 40th St., New York, N. Y. 



Ashcraft-Wilkinson Co., Atlanta, Ga. 



Atkins & Durbrow, Inc , 29 Burling Slip, New York, N. Y. 



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



Barrie Laboratories, Inc., 6 Beacon St., Boston, Mass. 



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



Berkshire Chemical Co., 92 Howard Ave., Bridgeport, Conn. 



Bon .\ibor Chemical Co., 390 Straight St., Paterson, N. J. 



Joseph Breck & Sons Corp., 85 State St., Boston, Mass. 



C. E. Buell, Inc., 131 State St., Boston, Mass. 



Butchers Rendering Co., Fall River, Mass. 



C & R Sales Co., Box 835, Worcester, Mass. 



Lyman Carrier, Granger, Ind. 



Central Chemical Co., 1115 Main St., Bridgeport, Conn. 



Clay & Son, Temple Mill Lane, Stratford, London, England. 



Collins Seed .Service Co., 60 Congress St., Boston, Mass. 



Colloidal Phosphate Sales Co. of New England, 126 Newbury St., Boston, Mass. 



Consolidated Rendering Co., 40 North Market St., Boston, Mass. 



Consumers Import Co., Inc., 115 Broad St., New York, N. Y. 



Cutler Co., North Wilbraham, Mass. 



Davey Tree Expert Co., Kent, Ohio. 



Jacob Dold Packing Co., 745 Wilham St., Buffalo, N. Y. 



.lohn C. Dow Co., 200 Broadway, Cambridge, Mass. 



Eastern States Farmers' Exchange, Box 14.S2, Springfield, Mass. 



Eastern States Poultry Manure Corp., 420 Lexington Ave., New York, N. Y 



Thomas W. Emerson Co., 213 State St., Boston, Mass. 



Essex Fertihzer Co., 39 North Market St., Boston, Mass. 



Excell Laboratories, 4535 Ravenswood Ave., Chicago, 111. 



Ford Motor Co , Dearborn, Mich. 



H. L. Frost & Co., 10 Mill St., Arlington, Mass. 



Gloucester Products Co., 3 Angle St. (rear), Gloucester, Mass. 



Goulard & Olena, Inc., 140 Liberty St., New York, N. Y. 



GrasseUi Chemical Co., Inc., Guardian Building, ('leveland, Ohio. 



Halfhill Co., 783 Ceres Ave., Los Angeles, Cal. 



Thomas Hersom & Co., New Bedford, Mass. 



Humphreys-Godwin Co., Memphis, Tenn. 



