THE AH so UPTIME PROPERTIES OF SOILS 353 



SANDYSOtL 



FIG. 56. Curves showing the absorption of K in parts to a million by 

 various soils from a solution containing 200 parts to a million of K. 

 The volume of the percolate is used as the abscissas. 



252. Time required for absorption. The amount of 

 absorption depends on the time of contact between the 

 soil and the solution. While a large part of the dissolved 

 base is taken up in a short time after being placed in 

 contact with the soil, the maximum absorption is effected 

 only after a considerable period. Ammonia, according 

 to Way, reaches its maximum absorption in half an hour ; 

 while Henneberg and Stohmann 1 found that phosphorus 

 required twenty-four hours to reach the same degree of 

 absorption. 



1 Henneberg, W., and Stohmann, F. Ueber das Verhalten der 

 Ackererde gegen Losungon von Ammoniak und Ammoniaksalzen. 

 Jour. f. Landw., None Folge, Band 3 (Der ganze Reihe siebenter 

 Jahrgang), Seite 25-47. 1859. 



2A 



