28 
REMOVAL OF ABSORBED PHOSPHATE. 
In the following table will be found the results showing removal of 
absorbed phosphoric acid by distilled water from soil No. 517: 
Absorbed phosphoric acid removed from soil. 
[Expressed in parts per million PO< in the percolate.] 
Percolates of 
100 cc. each. 
Ammonium sulphate, po- 
tassium phosphate, and 
potassium sulphate. 
Ammonium sulphate, cal- 
cium phosphate, and 
potassium sulphate. 
Sodium nitrate, calcium 
phosphate, and potas- 
sium sulphate. 
Un- 
treated. 
Heated. 
Chloro- 
form. 
Un- 
treated. 
Heated. 
Chloro- 
form. 
Un- 
treated. 
Heated. 
Chloro- 
form. 
200 
425 
350 
^550 
425 
325 
300 
145 
115 
140 
44 
36 
425 
350 
425 
350 
400 
375 
125 
100 
110 
96 
64 
375 
250 
450 
475 
400 
425 
100 
100 
100 
96 
64 
625 
525 
700 
500 
325 
650 
625 
400 
700 
825 
200 
350 
140 
120 
120 
96 
82 
425 
300 
525 
475 
300 
300 
390 
120 
120 
96 
82 
500 
350 
500 
525 
300 
300 
160 
145 
100 
96 
82 
550 
300 
325 
400 
650 
500 
475 475 
600 
325 
450 
150 
135 
110 
96 
88 
325 
350 
135 
120 
- 120 
96 
88 
300 
700 
300 
800 
190 
900 
125 
1,000 
110 
1,100 
96 
1,200 
82 
SUMMARY. 
0. 7588 
.2855 
0.8548 
.2820 
0. 6670 
.2835 
1. 3982 
.3679 
1.278 
.3184 
1.0678 
.3658 
1.6134 
.3133 
1.2116 
.3058 
37.7 
33.1 
42.4 
26.4 
25. 
34.1 
19.4 
25.2 
P0 4 fixed gm.. 
P0 4 removed..gm.. 
Per cent of P0 4 re- 
moved 37.7 
1.5014 
20.0 
The above results show that the concentration of phosphate in 
the percolate decreased quite rapidly, approaching a constant. Ap- 
parently the potash salt was less strongly fixed as the precentage re- 
moved is greater than the calcium salt. 
REMOVAL OF ABSORBED POTASH. 
In the following table will be found the results showing removal 
of absorbed potash by distilled water from soil No. 517: 
Removal of absorbed potash. 
[Expressed in parts per million K in the percolate.] 
Percolates of 
100 cc. each. 
Ammonium sulphate, po- 
tassium phosphate, and 
potassium sulphate. 
Ammonium sulphate, cal- 
cium phosphate, and 
potassium sulphate. 
Sodium nitrate, calcium 
phosphate, and potas- 
sium sulphate. 
Un- 
treated. 
Heated. 
Chloro- 
form. 
Un- 
treated. 
Heated. 
Chloro- 
form. 
Un- 
treated. 
Heated. 
Chloro- 
form. 
200 
204 
115 
112 
108 
96 
96 
72 
76 
76 
48 
68 
56 
84 
80 
72 
52 
84 
52 
72 
48 
44 
68 
108 
96 
104 
96 
68 
92 
68 
64 
56 
60 
68 
48 
36 
40 
40 
16 
52 
28 
40 
32 
20 
24 
44 
32 
44 
32 
16 
40 
48 
56 
40 
40 
32 
32 
48 
40 
48 
16 
32 
44 
36 
40 
68 
20 
36 
60 
56 
56 
44 
32 
44 
44 
300 
40 
400 
36 
500 
52 
600 
20 
700 
36 
800. . , 
28 
900 
44 
16 
16 
24 
36 
12 
20 
32 
44 
28 
24 
32 
32 
1,000 
20 
1,100 
20 
1,200 
20 
SUMMARY. 
K removed gm. 
0. 1072 
0.0712 
0. 0S80 
0. 0376 
0. 0424 
0. 0316 
0.0344 
0. 0420 0. 0348 
