19 
ABSORPTION OF POTASH. 
The strength of solution used in the potash series was the same as 
in the first series. One hundred-gram portions of soil were used. 
The results of extraction of the original soils are given in the follow- 
ing tables: 
Removal of potash from soil by distilled water. 
[Expressed in parts per million of K ih the percolate.] 
Percolates of 
100 cc. each. 
Fresh 
soil. 
Fresh 
subsoil. 
Air-dry 
soil. 
Air-dry 
subsoil. 
Percolates of 
100 cc. each. 
Fresh 
soil. 
Fresh 
subsoil. 
Air-dry 
soil. 
Air-dry 
subsoil. 
100 
40 
17.4 
56 
32 
14.8 
32 
64 
52 
48 
32 
36 
32 
400 
52 
68 
32 
84 
16 
27 
23 
200 
500 
300 
600 
The results of determinations of the absorption of potash from 
potassium sulphate are given in the following table : 
Absorption of potash from a solution containing 204 parts per million Kfrom K 2 S0 4 . 
[Expressed in parts per million in the percolate.] 
Percolates of 
100 cc. each. 
Fresh 
soil. 
Fresh 
subsoil. 
Air-dry 
soil. 
Air-dry 
subsoil. 
Percolates of 
, 100 cc. each. 
Fresh 
soil. 
Fresh 
subsoil. 
Air-dry 
soil. 
Air-dry 
subsoil. 
100 
64 
68 
212 
216 
164 
172 
192 
180 
184 
52 
44 
136 
160 
168 
180 
180 
180 
196 
52 
80 
104 
180 
180 
180 
172 
184 
192 
68 
24 
60 
120 
120 
120 
140 
180 
180 
1,000 
1,100 
1 ,200. . . 
172 
152 
176 
152 
180 
180 
196 
192 
172 
196 
204 
188 
212 
176 
200 
192 
300 
184 
400 
1,300. 
200 
500 
1,400 
1,500 
1,600 
1,700 
| 1,800. 
200 
200 
216 
20S 
200 
192 
212 
204 
180 
600 
176 
700 
188 
800 
192 
900 
200 
1 
Summary of above table. 
Sofl. 
K added 
to 100 
gm. soil. 
K fixed 
by 100 
gm. soil. 
Per cent 
ofK 
fixed. 
Fresh soil 
Grams. 
0. 34G8 
.3468 
.3672 
.3672 
Grams. 
0.0468 
.0636 
.0528 
.0972 
13.5 
Fresh subsoil 
18.3 
Air-dry soil 
14.4 
Air-dry subsoil 
26.5 
The effect of the potassium sulphate solution on the solubility of 
lime and magnesia is shown in the following table : 
Effect of potassium sulphate solution upon the solubility of lime and magnesia. 
[Expressed in parts per million in the percolate.] 
Percolates of 100 cc. 
each. 
Lime (CaO). 
Magnesia (MgO). 
Fresh 
soil. 
Fresh 
subsoil. 
Air-dry 
soil. 
Air-dry 
subsoil. 
Fresh 
soil. 
Fresh 
subsoil. 
Air-dry 
soil. 
Air-dry 
subsoil. 
100 
300 
600 
1,700 
60 
50 
44 
u 
38 
64 
34 
16 
62 
38 
62 
20 
50 
54 
52 
24 
34 
56 
20 
18 
28 
56 
20 
12 
34 
18 
20 
14 
30 
20 
20 
12 
