16-1 



Salts absorbed from a solution, during 20 minutes, by black marsh 

 soil in three productive conditions. 



The two solutions were made up to have, approximately the 

 same concentration but in the (A), solution potassium nitrate was 

 used with calcium chloride; while in the (B) solution calcium 

 nitrate and potassium chloride were used. The other ingredi- 

 ents were calcium phosphate (CaHpO 4 , 2H 2 O) and magnesium 

 sulphate (MgS0 4 , 7H 2 O). 



It will he seen from the table that the soil, under the good 

 corn, yielded to distilled water most potash, most phosphoric 

 acid, most chlorine and most silica ; while the soil under the 

 poor corn yielded most lime, magnesia, nitric acid, and sulphuric 

 acid; and the soil under no corn gave least potash, magnesia, 

 and chlorine. 



Potash was absorbed from both the nitrate and chloride in 

 nearly the same amounts by the three conditions of soil, except 

 that the "no corn" soil took up 108 parts per million as the ni- 

 trate and only 80 parts from the chloride, throwing out the 



