36 



methods. The actual availability based on the yield of dry matter was 51 per 

 cent, and on the basis of nitrogen recovered 50 per cent, as compared with dried 

 blood at 80 per cent. The water insoluble nitrogen showed an activity of just 50 

 per cent by the alkaline, and 79 per cent by the neutral method. The actual 

 availability of this part of the nitrogen was low, being about 46 per cent on the 

 basis of both jdeld of diy matter and nitrogen recovered. 



Georgia Tankage. The activity of the total nitrogen was satisfactory by both 

 laboratory methods. The availability of the total nitrogen was 53 per cent on the 

 basis of yield of dry matter, and 49 per cent on the basis of nitrogen recovered. 

 The water insoluble nitrogen showed a passing quality by both laboratory methods, 

 but an actual availability of only about 50 per cent on the basis of jdeld of dry 

 matter, and 48 per cent on the basis of nitrogen recovered. 



Hynite Tankage. The total nitrogen showed a satisfactory activity by both 

 laboratorj^ methods, and an actual availability of about 62 per cent on the basis of 

 yield of dry matter, and 59 per cent on the basis of nitrogen recovered. The 

 water insoluble nitrogen showed a satisfactory activity by both laboratory methods, 

 but showed a low availability by the vegetation test, about 48 per cent on the basis 

 of yield of dry matter, and 49 per cent on the basis of nitrogen recovered. These 

 figures confirm the low availability noted on the water insoluble portion of the 

 nitrogen on this material in 1926. 



Rehmsdorf Tankage. The activity of the total nitrogen by both laboratory 

 methods was satisfactory. The availability of the total nitrogen by the vegetation 

 test was 57 per cent on the basis of the jdeld of dry matter, and 53 per cent on 

 the basis of nitrogen recovered. The water insoluble nitrogen showed an activity 

 of only 45 per cent by the alkaline, and 81 per cent by the neutral permanganate 

 method. The availability of this part of the nitrogen was low, being only 45 per 

 cent on the basis of dry matter yield, and 43 per cent on the basis of nitrogen 

 recovered. This confirms the low availability noted on the water insoluble nitrogen 

 on this material in the 1926 experiment. 



ImhofF Tank Sewage Sludge. The total nitrogen showed a fair activity by 

 the alkaline, and a low activity by the neutral method. The actual availability 

 of the total nitrogen was low on the basis of both yield of dry matter and nitrogen 

 recovered. The water insoluble nitrogen showed only 46 per cent activity by the 

 all?;aline, and 83 per cent by the neutral method. The actual availability of this 

 part of the nitrogen as measured by the vegetation experiment was low, but was 

 about equal to the actual availability of its total nitrogen. 



Horn and Hoof Meal. Both the laboratory methods and the vegetation test 

 classed both the total nitrogen and the water insoluble nitrogen in this material 

 as being of good quality. 



Animal Tankage. Both the activity and actual availability of the total nitrogen 

 were satisfactory. The water insoluble nitrogen showed a passing quality by 

 only a small margin by the allcaline method, and about 92 per cent by the neutral 

 method. The actual availability of this part of the nitrogen was not satisfactory, 

 being less than 51 per cent on the basis of }deld of dry matter, and about 49 per 

 cent on the basis of nitrogen recovered. The product had the appearance of being 

 a mixture of animal tankage and processed low-grade material. 



The accompanying photographs furnish interesting confirmation as to the 

 growth secured from the use of each nitrogen product. 



DIRECTORY OF MANUFACTURERS WHO REGISTERED FERTILIZERS 

 FOR SALE IN THE STATE IN 1927. 



The American Agricultural Chemical Co., 92 State St., Boston, Mass. 



American Chemical Specialties Co., Springfield, N. J. 



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



American Soda Products Co., 322 Chestnut St., Moorestown, N. J. 



Apothecaries Hall Co., 8-24 I^enedict St., Waterbury, Conn. 



Armour Fertilizer Works, 50 Broad St., New York, N. Y. 



Ashcraft- Wilkinson Co., 601 Trust Company of Georgia Bldg., Atlanta, Ga. 



Atlantic Packing Co., 40 North Market St., Boston, Mass. 



The Baker Castor Oil Co., 120 Broadway, New York, N. Y. 



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



Barrie Laboratories, Inc., 261 Franklin St., Boston, Mass. 



Beach Soap Co., cor. Maple and Lawrence Sts., Lawrence, Mass. 



The Berkshire Chemical Co., Bridgeport, Conn. 



Bon Arbor Chemical Co., Inc., 390-2 Straight St., Paterson, N. J. 



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



