OXIDATION PROCESSES IN THE SOIL 



533 



A marked antagonism was found 58 to exist between the anions of 

 Na 2 C0 3 , Na 2 S04 and NaCl in respect to nitrification in soils. Com- 

 bination of salts, each of which is toxic, may not only bring about 

 normal nitrification but may even stimulate it. 0.2 per cent NaCl is 

 antagonized by 0.05 per cent Na 2 S04 or 0.025 per cent Na 2 C0 3 ; 0.35 

 per cent Na 2 SC>4 is antagonized by 0.15 per cent NaCl or 0.02 per cent 



loo- 



s' 



a 



Fig. 34. Influence of dicyanodiamide upon nitrate production in the soil 

 (from Cowie). 



Na 2 C0 3 ; 0.05 per cent Na 2 C0 3 is antagonized by 0.4 per cent Na 2 SC>4 or 

 0.2 per cent NaCl. These results, however, need to be interpreted in 

 terms of physiological processes. 



68 Lipman, C. B., and Burgess, P. S. Antagonism between anions as affecting 

 soil bacteria. II. Nitrification. Centrbl. Bakt. II, 41: 430-444. 1913; Plant 

 World, 17: 295. 1914. 



