540 
Journal of Agricultural Research 
Vol. XI, No. ii 
In another series, reported in Table VII, o.i per cent of sodium chlorid 
in solution was added to a portion of the medium sand, in order to deter¬ 
mine if the mass of salt present affects the rate of salt movement through 
sandy soil. It is obvious, from a comparison of the data with those in 
Table VI, that the movement becomes somewhat less rapid with the de 
crease in the amount of salt added to the soil. After 5 days the concen¬ 
tration of the soil solution in the first inch of soil was far less than it was 
in the previous series, and at the end of 10 days the increase in concentra¬ 
tion of the soil solution was measurable in the second inch, whereas in the 
previous series the concentration had increased 5 inches from the salt 
layer. 
Table VII .—Changes in the concentration of the soil solution induced by the addition of 
0.1 per cent of sodium chlorid to a medium sand 
Distance from salt 
layer. 
Inches. 
4 . 
3. 
2. 
I. 
O. 
O. 
Freezing-point 
lowerings. 
Distance from salt 
layer. 
Freezing-point 
lowerings. 
5 days. 
10 days. 
5 days. 
xo days. 
0. 000 
0.000 
Inches. 
O. 
O. 130 
0. 080 
. goo 
. OOO 
I. 
. 018 
.025 
. 000 
. Ol8 
2. 
. OOO 
. OIO 
.025 
. 020 
3 . 
. 000 
. OOO 
.085 
. 060 
4 . 
. OOO 
. OOO 
. 140 
. 080 
Potassium chlorid was added to the medium sand, and the changes in 
the concentration of the soil solution in the soil were likewise determined 
after 5 and 10 days, respectively. The middle section of the brass tubes 
were filled with soil which had previously been treated with 0.9 per cent 
of the salt in solution, the moisture content of the entire soil column 
being 9 per cent. It is notable from Table VIII, and graphically repre¬ 
sented in figures 4 and 5, that the concentration of the soil solution had 
increased in the first inch of soil after 5 days, and that the material in 
solution had passed into the third inch of soil after 10 days. 
Table VIII .—Changes in the concentration of the soil solution induced by the addition of 
O.g per cent of potassium chlorid to a medium sand containing g per cent of water 
Distance from salt layer. 
Freezing-point 
lowerings. 
Distance from salt layer. 
Freezing-point 
lowerings. 
S days. 
10 days. 
S days. 
10 days. 
Inches. 
4. . 
0 . OOO 
. OOO 
. OOO 
• 075 
. 26< 
. 260 
0. OOO 
. 009 
. 014 
. 120 
• 255 
. 265 
Inches. 
0. 
O. 240 
. 090 
. OOO 
. OOO 
. OOO 
0. 210 
•095 
•01S 
. 00% 
. 000 
7 . 
1. 
2 .*. 
2. 
1. 
0. 
0 . 
A . 
