Dec. 24,1917 Decomposition of Green and Stable Manures in Soil 693 
manure, as was thought at first. Or, if it did, it was more than over¬ 
come by the effect of the drying. Another important thing to be noted 
in connection with the curves in figures 6 and 7 is that, after about the 
one-hundred-and-twentieth day of the experiment, the amount of car¬ 
bon being given off from the soils treated with the oats was about the 
same as the control soil. This means that most of the carbon of the 
green manure has been decomposed and evolved. The same may be 
said in regard to soil treated with lime and oats when compared to 
the soil treated with lime only. 
Fig 9.-—Graphs of the quantity of carbon evolved as carbon in soils treated with lime and clover alone 
and in combination with manure and lime. Period, 40-216 days. 
The curves for the clover-treated soil, with its various combinations, 
appear in figures 8 and 9. In general the same may be said in regard 
to the clover-treated as of the oat-treated soils. Here the fresh mate¬ 
rial decomposed much more rapidly than the dried and ground material 
of the former experiments. Also after the one-hundred-and-twentieth 
day, the rate of evolution of carbon as carbon dioxid is the same from 
the green-manured soil as the corresponding ungreen-manured. It is 
seen that here, as in the former experiment, the clover decomposed 
somewhat more rapidly than the oats. 
In Table IX the summarized data for the whole experiment is given. 
Since this table is constructed exactly as Table III, no further explana¬ 
tion is needed in regard to it. 
