On the Maiiurial KflTect of Calcium Cyanainide. 



99 



The result shows that Hme-nitrogen acted better when the phosphatic 

 manure was superphosphate (C) than when it was sodium phosphate (D) ; 

 in other words : tJie neutral mixture {C) was better than the alkaline 

 mixture {D). The physiologically acid ammonium sulphate acted however 

 better with sodium phosphate (B) than with superphosphate (A) ; also this 

 result leads to the inference : the neutral reaction of the total manure in B 

 was more favorable than the acidic reaction in A. 



The moderate dose of calcium carbonate in A' and B' was of no special 

 effect in connection with the ammonium sulphate, but this can be easily 

 understood, because the soil contained already some carbonate of lime. 



III. Second Experiment with Brassica Chinensis. 



The amount of nitrogen zvas here diminished to one third of that in 

 the preceding experiment, and two different kinds of soils^^ i.e. diluvial loamy 

 and alluvial sandy soils served for the test. Forty eight zinc pots (area= 

 1/200,000 ha.) were filled with the respective soils (15.75 ^'^o. per pot). 

 Twelve series were prepared, each consisting of four pots. To the respective 

 pots, the following manures were applied, g : 



i). The loimy soil from the upland of our station is very rich in humu;, while the sandy soil 

 fiO.ii the paddy field of Kawaguchi near Tokyo is almoit free from organic matter. 



