^A S. Fcliiyaina. 



as an alkaline manure, while ammonium sulphate is defined as a 

 physiologically acid nitrogenous manure. Since the ammonia formed by the 

 decomposition of lime-nitrogen will of course rapidly be transformed into 

 carbonate, the question as to which is the best source of nitrogen would be 

 simplified to this : Under ivJiich conditions is aininoniurn carbonate better 

 ihan annnoniiivi sulpJiate or sodium nitrate ? 



Kossowitch as well as Prianishnikow have demonstrated recently the 

 injury by too alkaline or too acid reactions. Also here at this stations as 

 well as at the college of agriculture at Komaba near Tokyo similar 

 observations have been made at about the same time. Thus it was observ'ed 

 by myself that ammonium sulphate in conjunction with secondary sodium 

 .phosphate produced a much better yield with Jirassica chinensis than when 

 the former was applied in conjunction with superphosphate. Since lime- 

 nitrogen is an actually alkaline manure, an addition of an acid phosphatic 

 manure would act here favorably — just the opposite from ammonium 

 sulphate. 



The sample of lime -nitrogen at my disposal contained 18.58 % N and 

 56.16 % CaO ; the ammonium sulphate^^ = 20.65 % N ; the crude potassium 

 sulphate =47. 5 5 % K2O ; the double superphosphater=4o.42 % V.D^ soluble 

 in water ; and the secondary sodium phospate was the pure preparation. 



I. Experiment with Hordeuin sati-uuni. 



Eighteen porcelain pots (area= 1/200,000 ha.) were filled each with 14.27 

 ■kilo, fresh alluvial loam poor in humus, and received the following manures : 



A 



8.752 g. ammonium sulphate 

 4.60 g. double superphosphate 

 3.91 g. potassium sulphate 

 8.44 g. sodium sulphate 



( S.JSZ g. ammonium sulphate 

 H < 9-38 secondary sodium phosphate 



C 3-9 1 g- potassium sulphate 



i). The ammonium sulphate in this experiment was the pure preparation. 



