ABSORPTION OF SALTS BY SOILS. 



143 



From the data in the table, it will be seen what variations 

 have occured in the individual determinations of samples of the 

 same soil type, taken from different portions of the same field, 

 and from different depths, both when washed in the salt solution 

 and when washed in the distilled water. The duplicate deter- 

 minations made on the salt solution will show what should be 

 allowed for the methods themselves, when working with such 

 concentrations as these have been. 



For purposes of comparing the absorptive effects of these soils 

 it will be proper to use the averages of the five determinations 

 for each depth, and this has been done in the next table: 



Amounts of salts absorbed in 24 hours by 120 grams of Janesville 

 Loam from 600 c. c. of a salt solution. 



From this table of averages it will be observed the data 

 show less phosphoric acid has been recovered from each of 

 the four depths than was recovered from the soil when washed 



