11 
Potash removed from the soils by distilled water. 
[Expressed in parts per million of K in the percolate. 1 
Percolates of 100 
cc. each. 
SoU No. 
292. 
SoU No. 
448. 
Soil No. 
428. 
Soil No. 
474. 
100 
52 
44 
20 
28 
8 
20 
44 
44 
28 
16 
16 
108 
68 
52 
56 
44 
200 
300 
44 
40 
20 
400 
500 
Thus it is shown that the general tendency of the soils was to yield 
a solution of fairly constant concentration. However, attention 
should be called to the fact that these figures do not represent parts 
per million in the soil, but simply in the solution obtained through 
percolation. 
The following table shows the absorbing power of the soils for 
potash, using a solution containing 214 parts per million of potassium 
sulphate. 
Absorption of potash from a solution of KzSO^. 
[Expressed in parts per mnlion of K in the percolate.] 
Percolates of 
of 100 cc. 
each. 
100.. 
200.. 
300.. 
400.. 
500.. 
600.. 
700.. 
800.. 
900.. 
1,000 
1,100 
1,200 
1,300 
1,400 
1,500 
1,600 
1,700 
Soil No. 
Soil No. 
Soil No. 
Soil No. 
292. 
448. 
428. 
474. 
60 
52 
48 
100 
52 
92 
56 
80 
40 
80 
40 
76 
64 
100 
52 
84 
76 
140 
124 
104 
56 
148 
152 
88 
60 
160 
156 
96 
72 
164 
188 
84 
76 
188 
192 
88 
76 
168 
192 
76 
64 
168 
212 
72 
84 
196 
192 
84 
136 
208 
200 
84 
96 
204 
204 
104 
120 
172 
200 
116 
128 
160 
204 
140 
124 
160 
196 
160 
Percolates of 
of 100 cc. 
each. 
1,800. 
1,900 
2,000 
2,100 
2,200 
2,300 
2,400 
2,500 
2,700 
2,900 
3,100 
3,300 
3,500 
3,700 
3,900 
4,100 
4,300 
Soil No. 
Soil No. 
Soil No. 
292. 
448. 
428. 
140 
164 
184 
132 
148 
188 
128 
164 
192 
120 
188 
180 
100 
172 
184 
148 
172 
188 
132 
200 
172 
116 
200 
180 
136 
200 
200 
152 
204 
216 
152 
224 
224 
184 
212 
232 
152 
220 
216 
160 
204 
224 
148 
216 
204 
164 
228 
200 
164 
220 
228 
Soil No, 
474. 
172 
160 
176 
168 
156 
180 
156 
168 
188 
168 
184 
204 
208 
212 
168 
200 
212 
Summary of above table. 
SoU No. 
K added 
tolOOgm. 
soU. 
K fixed 
by 100 
gm. soil. 
Per cent 
ofK 
fixed. 
292 
Gram. 
0.9030 
.9030 
.9030 
.9030 
Gram. 
0. 4030 
.1496 
.2380 
.2782 
45 
448 ; 
17 
428 
26 
474 
31 
In order more easily to explain the absorption of potash by soils 
it is of considerable importance to know the effect of the addition of 
potash upon the solubility of the other bases commonly occurring in 
soils. For this reason several determinations were made to ascer- 
tain the concentration of lime and magnesia in the filtrate. The 
table followiug gives the results of these determinations. 
