662 STATE BOARD UF AGRICULTURE. 



The above data show an increase in the concentration of the soil 

 solution after 10 days in all cases except one, namely, the virgin sample 

 of Clyde sandy loam, which remained practically constant. In three 

 cases there was a greater increase in the soluble salt content of the 

 virgin samples than of the cropped, while in two instances the increase 

 in concentration of the soil solution of the cropped soils was greater 

 than that of the virgin. 



After 30 days only two samples showed a greater increase in the salt 

 content of the virgin soils than of the cropped. In one case both cropped 

 and virgin samples decreased in soluble salt content and in one case 

 the increase was the same. 



It is interesting to note that the tendency for the soluble salt con- 

 tent to decrease between the 10-day and 30-day periods which was 

 observed with the high water content used in the preceding experiment 

 was much magnified in this series. 



The results obtained from Lenawee county soils with medium water 

 content are given in table 26. 



