69 



shoii intervals, after which tlicy were allowed to stand 

 until clear. Alicpiots were then evaporated on the 

 Waaler bath, and the determinations made in the usual 

 way. Except in table II the data given represent the 

 average of duplicate determinations. 



Nitrification of Pyridine, Quinoline, Quanidine 



Carbonate, Etc. 



To determine whether the compounds used in this 

 work were nitrilied in the soil to an appreciable extent, 

 and to determine the effect of lime on the nitrification, 

 the methods described above v/ere used. The period of 

 incubation varied with the soil used, from three and 

 one half to live months. Three difTerent soils were 

 used. Soil No. 1 was obtained from a plot on the 

 Experiment Station Farm which had received annually 

 a moderate application of ammonium sulphate, and is 

 quite acid. The experiment on this soil ran from June 

 15 to September 21, 1916. Soil No. 2 was obtained from 

 what is known as the 'Cullers Rotation Field," about 

 one mile south of Auburn. This soil, classed as Norfolk 

 sandy loam by the Bureau of Soils, is slightly acid. 

 The test ran from June 16 to September 16, 1916. Soil 

 No. 3 came from what is known as the "square acre" 

 on the Experiment Station Farm. It is moderately 

 acid. This experiment ran from Feb. 18 to June 21, 

 1915. The treatments given, and the amounts of ni- 

 trates found in the soils, in both limed and unlimed 

 conditions, are shown in table I. 



Table /. — Nitrification of Dried Blood, Pyridine, 

 Quinoline, Ete. Nitrates Expressed as p. p. m. 



of Dry Soil. 



