132 



From this comparison of Kullenberg's data it is seen that 

 only little more than half the amounts of potash were absorbed 

 from the very soluble chlorides and nitrates as from the phos- 

 phates, 



THE ABSORPTION OF SODA, LIME AND MAGNESIA FROM SOLU- 

 TIONS BY SOILS. 



Not so much work has been done relative to the absorption 

 of these and other bases by soils as has been done upon potash 

 and ammonia, but enough data has been accumulated to show, 

 that under certain conditions, these bases, as well as potash and 

 ammonia, may disappear from solutions when they are brought 

 in contact with soils or powder-form bodies of similar nature. 



ABSORPTION OF SODA. 

 OBSERVATIONS OF VOELCKER.* 



To ascertain the absorptive power of soils for soda Voelcker 

 operated upon 6 types with a. solution of chemically pure so- 

 dium chloride. Into a glass-stoppered bottle he put 3500 

 grains of soil and 28000 grains of water solution of sodium 

 chloride carrying 41.52 grains or 1482 parts per million of 

 Nad. The soil was in contact with the solution during 4 days, 

 receiving occasional agitation throughout the interval. 



A similar series was conducted with the same soils using KC1 

 instead of !N"aCl, and the results of both are brought into a sin- 

 gle table for comparison. 



Amount* of potash and soda absorbed by 6 soils. 



Journal Royal Agricultural Society, Second Series, Volume I, pp. 289-316. 



