28 



G. UuikuUiira and T. Iinaseki. 



B. Soil from Arakawa. 



. This result coincides exactly with that of the laboratory experiments 

 stated above and shows that glycerine favors denitrification in paddy soil 

 very much. The yellowish color of plants during the first period of growth 

 is most probably due to the poisonous action of nitrite formed by the 

 reduction of nitrate. 



VEGETATION EXPERIMENT II. 



36 zinc pots of ca. 25 cm. in diameter were filled with 11 Kg of humy 

 soil from Nishigahara and the following manures applied, 3 pots serving for 

 each trial. 



