May, '14] 



GRANITIC SOIL POTASSIUM. 



23 



sists of pure water, water-carrying calcium hydroxide, or such 

 salts as sodium nitrate, calcium sulphate, etc., and whether the 

 mineral is pure or mixed with clay. These facts are shown by 

 data in the following tables: 



Table XVII 



Reagent 

 added 



Amt. of 



reagent 



added in 



grams 



Cc. 

 water 



Amt. of K2O 



liberated in 



grams 



Aver- 

 age 



Amt. of KoO lib- 

 erated by action 

 of reagent 



o 

 o 

 o 



CaO 

 CaO 

 CaO 



CaS04 

 CaS04 

 CaS04 



NaNOs 

 NaNOs 



(NH4)2S04 

 (NH4)2S04 



NaaCOs 

 NaaCOs 



Na2HP04 

 Na2HP04 





 

 



1 

 2 

 2 



1 

 2 

 3 



1 

 2 



1 

 2 



1 

 2 



1 

 2 



180 



.0064 

 .0069 > 

 .0070 J 



.0122 ^ 



,0156 



.0168 



.0076] 

 .0080 \ 

 .0118 J 



.0120 1 

 .0121 J 



.0120 1 

 .0132 j 



.0096 1 

 .0109/ 



.0109 \ 

 .0087 J 



0067 







,0149 



.0091 



,0120 



0126 



0103 



0107 



.0082 



.0024 



,0053 



.0059 



,0036 



.0040 



The above table shows the amount of potassium going into 

 solution in a given volume of water upon stirring feldspar with 

 some of the more common fertilizer constituents. Figures show- 



