Dec. 24,1917 Decomposition of Green and Stable Manures in Soil 689 
Table VIII .—Quantity of carbon evolved as carbon dioxid per acre per day in soils of 
Experiment II —Continued 
Soil No. 
US- 
121 
days. 
122- 
128 
days. 
129- 
*35 
days. 
136- 
142 
days. 
143 “ 
149 
days. 
IS©" 
days. 
* 57 “ 
, l6 3 
days. 
164- 
170 
days. 
171- 
178 
days. 
179 - 
185 
days. 
186- 
192 
days. 
193 - 
199 
days. 
200- 
209 
days. 
2 ID- 
216 
days. 
1. 2. 
2-3 
3 *o 
3-3 
3 -o 
2*7 
1-9 
3*4 
2.8 
5*3 
06.4 
7.8 
14*1 
6*3 
4.8 
3,4 . 
5 -o 
4-0 
4.2 
3-5 
3*9 
2.8 
4*5 
4 -o 
6.1 
13*9 
9*3 
16.4 
147 
6.6 
5,6 . 
4-9 
6.0 
6.0 
5 *o 
4.6 
3*9 
7*0 
5*7 
8.9 
023*8 
3*3 
O 3*9 
5*9 
12.0 
7,8 . 
10. 2 
12.9 
13-6 
10.5 
10.3 
7 -i 
12.1 
9*3 
16.2 
0 16.6 
14*7 
a 19.4 
14.8 
12. 7 
9, 10. 
14-1 
18.0 
17 - 7 
13*7 
13*4 
9*7 
15*6 
12.6 
21.2 
a 26.9 
4*7 
13*2 
17*5 
13*5 
ii, 12. 
6.1 
6-3 
6.1 
4-9 
5*4 
4-2 
5*8 
5*4 
8.8 
0 7.1 
9*3 
- 3*9 
13-0 
10.5 
13 , 14 . 
07.6 
a 9-3 
a8.1 
O 12. 2 
08.9 
° 5 *I 
a 9 - 9 
0 8-8 
0 12. 2 
a 13.6 
O14.0 
614.4 
O 15,0 
0 12.0 
15,16. 
14.1 
10.9 
16.3 
II. 9 
Ii *5 
8.2 
12. 7 
11. 7 
17*0 
18.3 
23*3 
* 3*5 
15*5 
12. 7 
18. 
4.4 
5-5 
5-8 
4*6 
4*7 
3-5 
5*5 
4*5 
8.4 
8*5 
II.0 
6 9*5 
7*8 
5*9 
20. 
5 -o 
6.6 
6.2 
5*3 
4*9 
3*9 
7*2 
6*3 
8.4 
10.7 
13*4 
& 12.0 
10.6 
8.7 
21, 22. 
4-5 
5-7 
5-8 
4*7 
4*7 
3*8 
6.2 
4*5 
8*7 
7*9 
8.8 
0 8-5 
8.8 
6.6 
23 , 24 . 
4-5 
6.5 
6.7 
6*3 
4*9 
4 *i 
7*4 
6-8 
9*2 
10.7 
10.0 
0 10.7 
10.1 
7*3 
25, 26. 
2-9 
3-2 
3-7 
2*7 
3-2 
2.0 
3*8 
2.6 
6-0 
9.2 
10.0 
14*8 
10.9 
11.4 
27, 28. 
3-2 
5*2 
5-5 
3 *i 
4*5 
3*2 
4*5 
4*5 
6.9 
0 5 * 9 
7 *o 
13*7 
08.4 
7 *o 
29 . 
2.7 
3-7 
3*7 
3 *i 
2*9 
2.4 
3*8 
3*3 
6.1 
6-o 
6.8 
5*9 
7 *o 
4*5 
31 , 32 . 
3-6 
4-7 
4.9 
3*8 
3*5 
2.7 
5*9 
4*5 
6.8 
8.4 
6*3 
0 10.0 
8.9 
10.2 
® Represents value for one soil, one determination having been lost. 
& Represents values taken from the average of preceding and succeeding determinations, both duplicates 
having been lost. 
DISCUSSION OF THE CURVES 
In figures 4 and 5 appear the curves for the soils receiving the various 
amounts of stable manure used alone and in combination with lime. 
The control and limed soils are also shown. Special attention is called 
to the manner of construction of the curves in the two different figures. 
In these two and the succeeding figures different standards have been 
used which are thought to bring out the important points to advantage. 
These changes can be followed easily by watching the notation on each 
figure. All of the curves are seen to be well above the curves for the 
control soil. With the exception of a few isolated points, the curves for 
the limed soils are well above those for their respective unlimed soils. 
The fact that the limed soils almost invariably gave off more carbon 
dioxid than their respective unlimed duplicates, even toward the end 
of the experiment, which ran more than half a year, shows that there 
must be greater bacterial activity induced by the lime. Of course it 
might be said that the excess carbon dioxid came from the lime itself, 
but it will be shown in Table IX that less lime was used in the manured 
than in the unmanured soils. This precludes that explanation of the 
fact. Also it would seem that after such an extended length of time all 
of the soil acid would be neutralized, so that the most reasonable con¬ 
clusion is as stated above—namely, that lime increases bacterial activity 
to a marked extent. 
When compared to the curves for the manure in the former experi¬ 
ment, it is seen that the manure curve is well above that where dry, 
well-rotted manure was used, in spite of the fact that in the case of the 
dry manure much more organic matter was present than in the case 
of the wet manure. As shown in Table VI, the 11.3 gm. of wet manure 
