38 

 Conclusions Drawn from the Experiment. 



1. Pulverized Poultry Manure. 



(o) The activity of the total nitrogen was almost equal to that of the dried 

 blood by both the alkaline and neutral permanganate methods, ^^^lere the smaller 

 amount of nitrogen was used, the yield of dry matter was almost equal to that of 

 dried blood. Where double the amount of nitrogen was used, the j'^ield of dry 

 matter was not as favorable, showing an availabihtj^ of about 68 per cent, as 

 compared \vith. dried blood at 80. 



(6) On the basis of nitrogen recovered, it showed an availability of 82.60 per 

 cent with the smaller, and about 60 per cent with the larger nitrogen apphcation, 

 as compared with dried blood at 80. 



(c) In the studies with the water insoluble nitrogen (the washed product), 

 the alkaline method classed the insoluble nitrogen as inferior (below 50), while 

 the neutral method passed it as satisfactory (above 80). The actual availability 

 of the water insoluble nitrogen on the basis of yield of dry matter was about 38 

 per cent, and on the basis of nitrogen recovered, about 45 per cent, as compared 

 with dried blood at 80. 



(d) The experiment confirms our findings of the previous year with reference 

 to the low availability of the water insoluble nitrogen, which amounts to about 

 39 per cent of the total nitrogen carried by the product. In this instance the 

 nitrogen availabilities closely paralleled the nitrogen activity' secured on the water 

 insoluble nitrogen by the alkaline method. 



2. Rehmsdorf Tankage. 



(o) The acti\'ity of the total nitrogen by the alkaline and neutral methods 

 compared favorably with that for dried blood. The actual availability of the 

 total nitrogen by the vegetation test on the basis of dry matter yields was about 

 67 per cent where the smaller amount was used, and about 56 per cent where the 

 larger quantity was used, as compared with dried blood at 80. 



(b) On the basis of nitrogen recovered, it showed an availability of aJDOut 79 

 per cent with the smaller, and about 53 per cent with the larger nitrogen apphca- 

 tion, as compared with dried blood at 80. 



(c) Although both laboratory methods passed the quality of the water insoluble 

 nitrogen as satisfactory, the actual availability of this part of the nitrogen on the 

 basis of both the dry matter jaeld and nitrogen recovered was about 41 per cent, 

 as compared wath dried blood at 80. This confirms the results secured in 1925 as 

 to the availability of the water insoluble nitrogen which the product carries. 



3. Ammoniate A and Ammoniate B. 



(a) The activity of the total nitrogen on both products by the alkaline method 

 classed them as inferior. The activity by the neutral method was above 85 per 

 cent, as compared with dried blood at 98. The availability of the total nitrogen by 

 the vegetation test on the basis of dry matter yields was about 28 and 32 per cent, 

 respectively, for Ammoniate A and Ammoniate B with the smaller, and about 24 

 and 25 per cent with the larger nitrogen application, as compared with dried 

 blood at 80. 



(6) On the basis of nitrogen recovered, about the same availabilities were noted, 

 namely, 29 and 37 per cent with the smaller, and 19 and 20 per cent with the 

 larger application. 



(c) The two products carried but a fraction of one per cent of water soluble 

 nitrogen, which accounts for the close agreement of results secured with the water 

 insoluble nitrogen as compared with those results secured with the total nitrogen. 



(d) All of the vegetation tests classed the nitrogen carried by the two products 

 as inferior, with Ammoniate B somewhat the better grade. 



