35 

 Conclusions Drawn from the Experiment. 



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

 the allvaline and neutral permanganate methods. On the basis of both yield of 

 dry matter and nitrogen recovered, the nitrogen availability was approximately 

 52 per cent and 51 per cent, as compared with dried blood at 80 per cent. In the 

 study with the water insoluble nitrogen (the washed product) the alkaline perman- 

 ganate method classed the insoluble nitrogen as inferior (below 50 per cent) while 

 the neutral method barely passed it (80 per cent or above) . The actual availability 

 of the water insoluble nitrogen on the basis of yield of dry matter was about 44 

 per cent, and on the basis of nitrogen recovered about 43 per cent, as compared 

 with dried blood at 80 per cent. 



Nitrolene. The activity of the total nitrogen by the alkaline method was about 



per cent higher, and by the neutral method only about 9 per cent lower, than 

 was shown by dried blood. The actual availability of the total nitrogen by the 

 vegetation test was only 55 per cent and 56 per cent, respectively, on the basis 

 of dry matter yield and nitrogen recovered. Both laboratory methods condemned 

 the quality of the water insoluble nitrogen, showing an activity of about 49 per 

 cent by the alkaline, and 73 per cent by the neutral permanganate method. The 

 actual availability of the water insoluble nitrogen was about 38 per cent on the basis 

 of yield of dry matter, and 40 per cent on the basis of nitrogen recovered, as com- 

 pared ^yiih dried blood at 80 per cent. 



Nitrogenous Tankage. The activity of the total nitrogen by the alkaline 

 method was classed as inferior; the activity by the neutral method was about 87 

 per cent, as compared with dried blood at 99 per cent. The actual availability of 

 the total nitrogen on the basis of dry matter yield and nitrogen recovered was 43 

 per cent and 42 per cent, respectively, as compared with dried blood at 80 per cent. 

 The alkaline method condemned the quality of the water insoluble nitrogen, while 

 the neutral method gave an activity of about 85 per cent. The actual availability 

 of this part of the nitrogen was about 42 per cent on the basis of both dry matter 

 yield and nitrogen recovered. Thus it Avill be seen that all of the vegetation tests 

 class the nitrogen in this product as inferior. This confirms the results secured 

 in 1926 on Ammoniate A and Ammoniate B, the names under which this product 

 was then sold. 



Process Tankage. The activity of the total nitrogen was about 55 per cent 

 and 95 per cent, respectively, by the alkaline and neutral permanganate methods. 

 The actual total nitrogen availability by the vegetation test was about 58 per cent 

 on the basis of yield of dry matter, and 56 per cent on the basis of nitrogen recovered. 

 The water insoluble nitrogen was condemned by the alkaline method, but showed 

 an activity of 86 per cent by the neutral method. The availability of this part of 

 the nitrogen by the vegetation test was 52 per cent on the basis of dry matter yield, 

 and 53 per cent on the basis of nitrogen recovered. 



Milorganite. The activity of the total nitrogen was about 56 per cent and 

 83 per cent, respectively, by the allcaline and neutral permanganate methods. 

 The nitrogen availability as measured by the vegetation test was 61 per cent on the 

 basis of jdeld of dry matter, and 57 per cent on the basis of nitrogen recovered. 

 The water insoluble nitrogen showed a low test by the alkaline method, but was well 

 above the passing mark by the neutral method. The actual availability of this 

 part of the nitrogen was about 84 per cent on the basis of yield of dry matter, and 

 85 per cent on the basis of nitrogen recovered. These unlooked for results were 

 from 22 to 28 points higher than the availability of the total nitrogen in the original 

 material, and nearly 50 points above the insoluble nitrogen activitj' as measured 

 by the alkaline permanganate method . The high availability of the water insoluble 

 nitrogen as compared with the availability of the total nitrogen might indicate that 

 ^ome soluble toxic compounds were washed out in the preparation of the material 

 "or this experiment. 



Agrinite. The total nitrogen activit}"- was satisfactory by both laboratory 

 methods, as was also its availability by the vegetation test. The water insoluble 

 nitrogen showed a passing quality by both laboratory methods and a satisfactory 

 availabilit}^ by the vegetation test. 



Avail Tankage. The total nitrogen showed a fair activity by both laboratory 



