102 
Journal of Agricultural Research 
Vol. *6, No. 3 
EXPERIMENT 12.—IGNITED SOIL+CALCIUM HYDRO "ID 
In this experiment Ca(OH) 2 was added to Oswego silt loam after it 
had been ignited. Weighed portions of soil as needed for the separate 
determinations were placed in flat-bottomed porcelain dishes and heated 
at 650° for five hours in an electric muffle having an automatic tern- 
___ \ \ t _ f 1 _ » ______ 
0 10 20 30 40 50 60 70 QO 90 
Fig. 6.—Curves showing the influence of KC 1 on the adsorption of calcium from Ca(0H)2. 
perature control. After cooling, the ignited soil portions were trans¬ 
ferred to bottles, and the subsequent treatment was the same as in 
Experiment 5. The loss on ignition as determined on one set of samples 
was nearly 5 per cent. The data obtained are presented in Table XII. 
Table XII. — Ph of suspensions and extracts of ignited soil-\-Ca(OH) 2 , titrations and 
calcium content of extracts, and calcium adsorbed from Ca(OH) 2 
Calcium added. 
! 
| Suspension. 
Extract. 
0.05N. 
HC 1 . 
Calcium in 
extract. 
Calcium not 
adsorbed. 
Calcium 
adsorbed. 
Mgm. 
Ph 
Ph 
Cc. 
Mgm. 
Mgm. 
Mgm. 
O . 
5 - 56 
7.83 
O. O 
I. 2 
O. 0 
O. 0 
4 . 
6.78 
7. 96 
-4 
2.4 
I. 2 
2.8 
8 .... 
8. 20 
8. 84 
.6 
3*0 
1.8 
6 . 2 
12. 
9. 42 
9.48 
•9 
4.2 
3-0 
9.0 
16. 
9. 99 
10. 60 
2 -5 
8.9 
7-7 
8-3 
20. 
10. 40 
10. 97 
2.7 
9.2 
8. 0 
12. 0 
28. 
11.97 
11. 17 
3-4 
IO. O 
8.8 
19. 2 
36 . 
n -34 
11. 58 
6. 5 
15-2 
14. 0 
22. 0 
48. 
11. 61 
11. 85 
16. 7 
24. O 
22. 8 
25.2 
60. 
11. 68 
11. 90 
24. 2 
33*3 
32.1 
27.9 
80. 
11. 87 
12. 01 
27.4 
40 . 5 
39-3 
40.7 
