24 
The solution used in the first series of three, columns 1, 2, and 3 
contained 750 parts per million P0 4 from potassium phosphate; 4, 5, 
and 6, 2,050 parts per million P0 4 from calcium phosphate; 7, 8, and 
9, 1,650 parts per million P0 4 from calcium phosphate; 10, 11, and 12, 
700 parts per million P0 4 from potassium phosphate; 13, 14, and 15, 
435 parts per million P0 4 from calcium phosphate; 16, 17, and 18, 425 
parts per million P0 4 from calcium phosphate. The solution used 
with soil No. 428 was made up to a much weaker strength for the 
reason that it would be more comparable with the results obtained 
on this soil given in the first series. 
The absorbing power of the red clay soil was appreciably less for 
phosphates in mixtures, but that of the highly organic soil is very 
much the same, regardless of method of application. The effect of 
heat or antiseptics was not striking, but in most instances caused a 
decrease in the fixing power. In one instance, namely, with the 
highly organic soil, the heat caused a decided decrease in fixing 
power. 
ABSORPTION OP POTASH. 
The results obtained with the application of potash in mixtures 
are shown in the following table : 
Absorption of potash from a solution of fertilizer mixtures. 
[Expressed in parts per million K in the percolate.] 
Percolates 100 cc. 
each. 
SoU No. 517 
Ammonium sulphate, po- Ammonium sulphate, cal- 
tassium phosphate, and I cium phosphate, and 
potassium sulphate. potassium sulphate. 
Untreat- 
ed. 
Heated. 
Chloro- 
form. 
Untreat- 
ed. 
Heated, 
Chloro- 
form. 
Sodium nitrate, calcium 
phosphate, and potas- 
sium sulphate. 
Untreat- 
ed. 
Heated. 
Chloro- 
form. 
100.. 
200.. 
300.. 
500.. 
700.. 
900.. 
1,100. 
1,300. 
1,500. 
1,700. 
1,900. 
2,100. 
196 
348 
440 
484 
544 
540 
540 
564 
544 
544 
488 
428 
180 
316 
440 
460 
508 
580 
584 
576 
560 
576 
564 
528 
268 
300 
376 
480 
552 
524 
572 
588 
504 
528 
544 
496 
172 
152 
44 
164 
124 
184 
156 
152 
196 
164 
120 
132 
80 
84 
224 
260 
216 
288 
224 
244 
188 
192 
156 
88 
72 
64 
228 
276 
200 
204 
176 
140 
216 
184 
108 
104 
176 
84 
216 
204 
180 
256 
228 
156 
284 
212 
112 
132 
104 
120 
232 
228 
188 
180 
236 
360 
144 
108 
68 
108 
140 
208 
232 
132 
172 
280 
288 
248 
SUMMARY. 
K added to 100 grams 
soil grams.. 
K fixed by 100 grams 
soil grams. 
1.0038 
1.0038 
1.0038 
0. 3570 
0. 3570 
0. 3570 
0.4536 
0. 4536 
0. 4536 
Per cent of K fixed . 
