On tile Influence of Solubility on Availability. 



9* 



The above result shows clearly that in the presence of lime as 

 carbonate, the necessary amount of magnesia applied in the form of 

 crystallized sulphate for barley in sand culture is so small that the best ratio 

 of lime to magnesia becomes 60 : 1, while in the form of nitrates of calcium 

 and magnesium in water culture the best ratio for Gramineae between 1/1 

 and 2/1. This conclusion will hold good also for various sandy soils, while 



for clayey soils the best ratio is ,„ ^ ; will differ, as T. Naka- 



MgO as sulphate 



mura J) ascertained. The calculation from the above results shows that with 

 barley 4.9 parts MgSO v 7HvO are agronomically equivalent to 100 parts 

 magnesite, while with rice this equivalent is still higher viz. 9.8. 



1). This Bulletin Vol. I, No. 1, P. 30-34. 



