1912. 



PUBLIC DOCUMENT — No. 31. 



29 



Table 3. 



Table 4. — Showing the Order of Excellence of the Different Chemicals 

 used as Fixers and the Percentage of Liberated Nilrogeti which each 

 Fixer absorbed. 



The above tables show that the 5 different samples of manure, 

 of 450 grams each, contained from 2.28 to 2.46 grams of nitro- 

 gen, and of these amounts from 5.85 per cent, to 12.99 per cent, 

 were liberated. Of the relatively' small amounts liberated the 

 sulfate of magnesia absorbed 38.88 per cent., and was followed 

 by the other chemicals as indicated in Table 4. How much more 

 nitrogen as ammonia would have been absorbed by the different 

 chemicals had the manure undergone a more normal fermenta- 

 tion it is impossible to state. The above tests strongly indicate 

 sulfate of magnesia and sulfate of potash-magnesia to be de- 

 cidedly preferable to gypsum as ammonia absorbents. 



If the above, however, were typical of actual farm condi- 

 tions we should have the following results : nitrogen in 1 ton 

 of barnyard manure, 37.2 pounds ; per cent, absorbed by sulfate 



