Oil tlie Bella vioi- of \itrate iii Paddy Soil. 



From these fig^ures the loss of nitroo-en was calculated. 



25 



These results show that when common dry land top-soil becomes 

 sufficiently moist, as by continuous rains, the presence of an easily putrefying 

 organic matter favors denitrification to a considerable degree.^^ 



VEGETATION EXPERIMENT 1. 2) 



In order to ascertain the effect of the formation of nitrite and denitrifica- 

 tion upon vegetation, the following experiments were made : Six zinc 

 pots of ca. 30 cm. in diametre were filled with 1 5 Kg of humy soil from 

 Nishigahara and six with alluvial soil from Arakawa. The following 



manures were applied per pot (in dupl 



|(NH,),S04 



(A). JNasHFOi 



iKaSOi 



XaN03 



(B). • Na2HP04 



K2SO4 



cate) : 



5-0 g 



5-0 „ 



5-0 „ 



6.7 „ (N in equivalent 



to (NH4),S04) 

 5-0 .. 



50 .. 



i). A considerable degree of denitrification was obseived by Hugo Fisher after moderately 

 liming the soil, but the amount of moisture was not stated. 



2). M\ vegetation experiments were carried out by G. Daikuhara. 



