694 
Journal of Agricultural Research 
Vol. XI, No. 13 
Table IX .—Summarized results of Experiment II 
Soil No. 
Organic 
carbon 
added. 
Total 
organic 
carbon 
at 
start. 
Inor¬ 
ganic 
carbon 
added. 
Total 
carbon 
lost. 
Inor¬ 
ganic 
carbon 
at 
end. 
Organic 
carbon 
lost. 
Excess 
organic 
carbon 
lost 
from 
limed 
over 
un¬ 
limed 
soil. 
Organic 
carbon 
lost 
from 
added 
manure, 
Carbon 
lost 
from 
added 
ma¬ 
nure. 
Total 
organic 
carbon 
lost. 
Organ¬ 
ic 
carbon 
from 
green 
ma¬ 
nure 
alone. 
Quan¬ 
tity of 
cal¬ 
cium 
car¬ 
bonate 
at end 
in 
limed 
soils. 
13 
i, 2... 
3 . 4 *** 
5 , 6 ... 
7 . 8 .. . 
9, 10.. 
ix, 12. 
14.. .. 
16.. .. 
18.. .. 
20.. .. 
21, 22. 
23, 24. 
25, 26. 
27, 28. 
29.. .. 
31* 33* 
None. 
None. 
3,686 
11,058 
18,430 
3,686 
11,058 
18,430 
4,801 
4,801 
4,740 
4,740 
1, «S 
1,115 
1,054 
1,054 
29.513 
29.513 
33,199 
40 ,571 
47,943 
33,199 
40,571 
47,943 
34,314 
34,314 
34,253 
34,253 
30,628 
30,628 
30 ,567 
30 ,567 
680 
680 
680 
680 
680 
680’ 
680 
680 
1,704 
2,727 
3,647 
8,208 
12,267 
4,323 
8,709 
12,703 
4,239 
5,088 
4,218 
5,033 
2,680 
3 , 3 io 
2,688 
3,259 
46 
182 
36 
34 
55 
206 
242 
226 
53 
230 
47 
218 
55 
230 
62 
P. ct. 
1 .750 
2,229 
3,683 
8,242 
12,322 
3,849 
8,321 
12,249 
4,292 
4,638 
4,265 
4 , 57 i 
2, 735 
2,860 
2.750 
2, 783 
479 
166 
79 
73 
343 
306 
125 
33 
1,933 
6,492 
10,632 
I, 620 
6,092 
10,020 
2,542 
2,409 
2,515 
2,342 
980 
52-4 
58.8 
57-7 
44.0 
55-1 
54-4 
52.5 
50.2 
52.8 
49-4 
78.9 
56.6 
95-0 
52.6 
P. ct. 
5-92 
7*55 
It. 10 
20. 70 
25*80 
11.60 
20.80 
25.60 
12.50 
13*50 
12.50 
13*40 
8 - 93 
9*34 
9.00 
9 - II 
609 
779 
582 
722 
Lbs. 
1,516 
1,715 
2 ,oro 
1,885 
I| 9 I 5 
1,815 
1,915 
1,700 
DISCUSSION OF THE RESULTS 
The quantity of carbonate carbon left in the soil at the end of the experi¬ 
ment and shown in column 6 are particularly interesting when compared 
with the values of the preceding experiment shown in Table III. The 
amount of inorganic carbon in the unlimed soil of the two experiments 
does not show any striking differences. This is to be expected, since, as 
stated earlier, this carbon probably is simply the carbon dioxid dissolved 
in the moisture of the moist soils used for the analysis. But, when an 
examination of the results for the limed soil is made, consistency is 
observed. In the experiment which ran for 216 days, 182 pounds of 
carbon remained, while 218 pounds were left in the experiment which ran 
only 53 days. Thus, in the time from the fifty-third day to the two- 
hundred-and-sixteenth day 36 pounds of carbon were lost. In terms of 
calcium carbonate#this represents 300 pounds. With the io-pound ma¬ 
nure treatment there were 455 pounds of calcium carbonate decomposed 
from the fifty-third to the two-hundred-and-sixteenth day. However, 
not too much significance should be placed on this figure because of the 
different character and amount of the manure used. In the case of the 
oats the difference is 335 pounds of carbonate. For the clover the differ¬ 
ence is 480 pounds. Somewhat more significance can be placed on these 
figures although no absolute dependence, for the green manures were in 
quite different states when added to the soils. 
Here, as in the former experiment, the manures act as conservers of 
lime. A discussion of this question is given in connection with the first 
experiment. The oats seem to use less of the lime than the clover. 
