ABSORPTION OF SALTS BY SOILS. 



121 



similar to that adopted by him in his work regarding the absorp- 

 tion of ammonia, already cited. 



Amounts of potash absorbed by different soils. 



For this absorption work Voelcker's solutions were all strong, 

 rangingj with two exceptions, from, 1213 to 6617 parts per mil- 

 lion of K 2 O. The Nos. 3 and 4 of the third series contained 

 only 215.7 parts per million, which is still higher than occurs 

 in natural soils, judged from amounts recovered by single wash- 

 ings of short duration. 



In the last two columns of the table have been set the amounts 

 of K 2 O in parts per million of dry soil which 20 per cent, and 

 10 per cent, of soil moisture would carry if it had the residual 

 strength of the several solutions ; or the strength after they had 



