Dec. io. 1917 
Movement of Soluble Salts through Soils 
54i 
In order to approach more nearly field-soil fertilization, 2 gm. of solid 
potassium chlorid and sodium carbonate, respectively, were placed in 
the middle of the tubes containing medium sand; otherwise the studies 
were conducted in the usual manner. The results presented in Table IX 
show that the concentration of the soil solution in the soil changes soon 
after solid salts are applied to the moist soils. The increase in the con¬ 
centration within 5 days was appreciable 2 inches from the layer of 
potassium chlorid in the tubes containing 3 per cent of water, and 3 inches 
from it in those containing 9 per cent of water. 
Fig. 4.—Graph of the freezing-point lowerings after 5 days, induced by the addition of 0.9 per cent of 
potassium chlorid to sand with 9 per cent of moisture. 
Tabi,B IX .—Changes in the concentration of the soil solution induced by the addition of 
2 gm. of powdered potassium chlorid to a medium sand 
Distance from 
salt layer. 
Freezing-point lowerings. 
Distance from 
salt layer. 
Freezing-point lowerings. 
9 per cent of 
water. 
3 per cent of 
water. 
9 per cent of 
water. 
3 per cent of 
water. 
5 days. 
15 days. 
5 days. 
15 days. 
5 days. 
15 days. 
5 days. 
15 days. 
Inches. 
4 . 
3 . 
2. 
I. 
0. OOO 
.030 
. 180 
. 418 
0.085 
.251 
*493 
. 691 
O. OOO 
. OOO 
• 132 
. 30O 
O. 003 
. 096 
. 214 
.277 
Inches. 
1 . 
2 . 
3 . 
4 . 
0. 650 
. 260 
.030 
. OOO 
0. 368 
•335 
. 117 
. 067 
O.255 
.050 
. OOO 
. OOO 
O. 282 
. 141 
. 113 
.005 
