Are Soils Poor in SO3 Benefited by Sulpliate*. j^? 



From these results we conclude : 



i). An amount less than 0.02 % SO3 in the three soils was quite 

 sufficient to meet the requirements of the barley plants for sulphur. 

 The difference in the harvests was too small to admit any other 

 conclusion than this. 



2). In the soil No. I and No. Ill the manuring with magnesia had no 

 decisive effect ; this may have been due to the small differences of 

 lime and magnesia contents in these soils. 



3). Soil No. W^ showed a very unfavorable mechanical condition being 

 a very stiff clay and was probably very poor in potassa-^ while the 

 amount of P.^Og was only 0.022%. Hence the addition of limestone 

 to the un-manured soil had very little effect although the mechanical 

 condition was improved, while with the manured soil the addition 

 of limestone produced a surprising increase of barley grains from 

 1.25 gto 38.63 g. 



i). This soil was found afterwards to have a strong acid reaction on litmus, and since this soil 

 contains only a little humus, the acidity would probably be due to acid silicates. Enormous increase 

 of harvest by liming of this soil is therefore partly explained by the neutralization of the acidity. 

 Many such acid soils occur in Japan and the result of investigation of these soils will be published 

 later on. 



2). A sample of soil taken from the same area contained only 0.088% KoO. 



