17 
Summary of preceding table. 
Sou. 
P0 4 
added to 
100 gm. 
soil. 
PO, 
fixed by 
100 gm. 
soil. 
Per cent 
01PO4 
fixed. 
Fresh soil 
Fresh subsoil.. 
Air-dry soil 
Air-dry subsoil 
Grams. 
9. 5950 
9. 5950 
6.8350 
6.8350 
Grams. 
3.8062 
3. 85 1 1 
2. 7372 
2. 6820 
39.6 
40.2 
40.1 
39.3 
The absorption of phosphoric acid from monocalcium phosphate 
was as follows : 
Absorption of phosphoric acid from a solution of Cal^ (PO i ) 2 ' 
[Expressed in parts per million of PO< in the percolate.] 
SOLUTION CONTAINED 1,300 PARTS PER MILLION PO4. 
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 
210 
470 
615 
210 
490 
585 
203 
750 
625 
203 
700 
800 
400 
700 
1,012 
925 
650 
1,012 
1,200 
700 
703 
200 
500 
300 
600 
SOLUTION CONTAINED 1,700 PARTS PER MILLION P0 4 . 
500. 
775 
850 
1,250 
1,000 
1,100 
1,025 
850 
1,300 
775 
850 
1,100 
1,000 
1,250 
1,000 
975 
1,275 
1,300 
1,400 
1,500 
1,600 
1,700 
1,800 
1,900 
1J00 
1,200 
1,350 
1,350 
1,350 
1,250 
925 
1,100 
1,150 
1,400 
1,250 
1,250 
1,325 
925 
600 
700 
1,300 
825 
900 
1,100 
1,100 
950 
1,275 
950 
950 
1,100 
1,100 
950 
800 
900 
1,000 
1,100 
1,200 
SOLUTION CONTAINED 2,812 PARTS PER MILLION PO4. 
1,700 
1,300 
1,250 
1,250 
2, 750 
3,000 
1,250 
1,925 
2,812 
2,812 
1,950 
1,300 
3,250 
3,500 
1,600 
1,550 
2,000 
1,350 
1,350 
2,812 
2,812 
2,450 
1,600 
3,800 
4,300 
2,812 
2,812 
2,812 
2,812 
2,500 
2,725 
1,450 
1,350 
1,400 
1,600 
Summary of above table. 
Soil. 
PO4 add- 
ed to 100 
gm. soil. 
PO< fixed 
by 100 
gm. soil. 
Per cent 
of PO4 
fixed. 
Grams. 
8. 3328 
8.3328 
6.9416 
6.9416 
Grams. 
5.9110 
5. 9880 
5. 5232 
5. 4732 
70.9 
71.8 
79.6 
78.8 
