32 



G. Uaikubara aii<i T. Iiiiaseki. 



These results show that the efficiency of nitrate nitrogen for the paddy 

 rice is very unsatisfactory and that the simultaneous application of certain 

 organic matters depresses the yield still further. Well rotten compost 

 exerts a less depressing influence than fresh rape cake. 



VEGETATION EXPERIMENT III. 



In order to compare, now, dry land with paddy field in regard to the 

 effect of their different degree of denitrification, the following experiment 

 with buckwheat was made : 36 zinc pots of ca. 25 cm. in diameter were 

 filled with 14 Kg humy soil from Nishigahara. The kind and the amount 

 of manures applied were the same as in the vegetation experiment II. 31 

 seeds of buckwheat were sown Aug. 27, 1905, and 2 weeks after germina- 

 tion the young plants were reduced to 25 per pot all of equal size. The 

 average height of plants measured Oct. i was as follows : 



The plants were cut Oct. 25 and weighed in the air dry state with the 

 following result : 



