8 
The amount of phosphoric acid fixed from a solution of mono- 
calcium phosphate (CaH 4 (P0 4 ) 2 ) is shown in the following table: 
Absorption of phosphoric acid from a solution of monocalcium phosphate (CaB^ (P0 4 ) 2 ). 
[Expressed in parts per million of PO4 in the percolate.] 
SOLUTION CONTAINED 232 PARTS PER MILLION PO*. 
Percolates of 
'100 cc. each. 
Soil No. 
292. 
Soil No. 
448. 
Soil No. 
428. 
Soil No. 
474. 
Percolates of 
100 cc. each. 
Soil No. 
292. 
Soil No. 
448. 
Soil No. 
428. 
Soil No. 
474. 
100 
40.0 
24.0 
23.2 
50.0 
10.4 
7.2 
10.8 
14.0 
9.6 
9.2 
8.0 
14.4 
24.8 
18.4 
22.4 
41.0 
500....' 
33.0 
17.2 
13.6 
16.0 
11.6 
11.6 
15.2 
11.2 
10.4 
39.0 
200 
600 
19.2 
300 
700 
16.8 
400 
SOLUTION CONTAINED 220 PARTS PER MILLION PO*. 
800.. 
900.. 
1,000. 
1,100. 
11.6 
11.6 
11.2 
14.4 
15.6 
4.4 
6.4 
11.2 
24.0 
4.0 
4.8 
21.2 
30.4 
4.8 
6.0 
21.6 
1,200. 
1,300. 
1,400. 
1,500. 
14.4 
6.0 
6.4 
18.4 
4.0 
8.4 
28.8 
5.2 
10.0 
17.6 
4.4 
8.0 
SOLUTION CONTAINED 132 PARTS PER MILLION PO< 
11.6 
13.6 
17.2 
21.6 
1,600 
44.0 
22.4 
17.6 
17.6 
4.4 
4.0 
4.0 
4.8 
4.0 
5.6 
8.0 
7.6 
21.6 
14.4 
15.2 
14.4 
2,000 
22. 4 
21.6 
35.2 
4.0 
5.2 
5.6 
4.0 
7.2 
6.4* 
16.8 
1,700 
2,100... . 
16.8 
1,800 
2,200... 
17.6 
1,900 
SOLUTION CONTAINED 200 PARTS PER MILLION P0 4 
Soil No. 
PO* 
added to 
100 gm. 
soil. 
2,400 
36.0 
22.4 
12.4 
4.0 
17.2 
7.2 
25.6 
12.8 
2,800 
2,900 
22.4 
20.8 
12.4 
5.2 
10.0 
5.6 
18.4 
2,600 
16.4 
SOLUTION CONTAINED 240 PARTS PER MILLION PO<. 
• 
3,100 
39.2 
76.0 
4.0 
4.8 
8.4 
8.0 
24.8 
36.8 
3,500 
16.8 
5.2 
5.6 
18.4 
3,300 
SOLUTION CONTAINED 240 PARTS PER MILLION PO*. 
3,700 
28.0 
10.0 
12.0 
14.0 
3,900 
24.0 
4.0 
6.4 
13.6 
Summary of above table. 
P0 4 fixed 
by 100 
em. soil. 
Per cent 
of PO< 
fixed. 
292 
448 
428 
474 
Oram. 
0. 8308 
.8308 
.8308 
Gram. 
0. 7190 
.8043 
.7966 
.7516 
86.4 
96.7 
95.8 
90.4 
