13 



Analyses of 23 samples made at this station give an average of 

 2o.jo^/c nitrogen. 



Organic nitrogen is derived from both animal and vegetable sub- 

 stances. Blood, fish and tankage are easily decomposed in the soil 

 and are considered among the best and most available of the organic 

 nitrogen containing substances of animal origin. Of the vegetable 

 sources of nitrogen, cottonseed meal, castor pomace, and linseed 

 meal are among the best and most available. The following table 

 gives a list of animal and vegetable substances with the average 

 composition of each. In one column of the table will be found the 

 comparative availability by the so-called alkaline permanganate 

 method, of the various organic substances furnishing nitrogen. 



Animal Ammoniates. 



Dried blood 



Tankage 



Dry ground tisli 



(iround bone 



Hoof meal 



Horn shavings 



Hair 



Wool waste 



(Garbage tankage 



Philadelphia tankage. . 

 (Ground leather 



Vegetable Ammoniates. 



Cottonseed meal 

 Linseed meal . . 

 Castor pomace. . 

 Muck or peat . . 





34 

 76 

 60 



253 



I 



I 



I 



13 



127 



7 

 6 

 I 



Nitrogen. 



7-99 

 4. II 

 6.06 



.85 



■39 



3-24 

 5.26 

 4.68 



1355 



1 1 .27 



10.48 



5-94 



8.30 



7-99 

 6.42 



5-85 



10. 16 

 5 "" 



6.74 

 5.78 

 5-i8 

 1-57 



i% 



65.7 

 61 .0 

 64.2 

 66.4 

 65.8 

 64.6 



57-3 

 41 .0 

 236 

 29.7 

 32.6 



46.3 

 45-2 



55-9 

 21.4 



14.00 



8.87 



24 -34 



■56 

 6.06 



2.56 

 1.47 

 2 . 12 



1.68 



I .64 

 1.52 

 1 .20 



The above figures, representinsr availability, were taken from the 14th Annual Report 

 of the Vermont Agricultural Experiment Station. 



The above method is not suited for the determination of nitrogen 

 availability in vegetable substances such as cottonseed meal, linseed 

 meal and castor pomace. .Actual experiments have demonstrated 

 that the nitrogen they contain is fully as available as that in the high 

 grade animal substances. The low availability of the nitrogen,. 



