690 Journal of Agricultural Research voi. xi, no. i 3 
representing an application of 10 tons per acre, was only equivalent to 
5.39 gm., or slightly less than 5 tons per acre. The reason for this is 
no doubt due to several causes. One of these is that many more bac¬ 
teria were added with the fresh manure, and the second is that drying 
resulted in precipitation of considerable soluble organic matter in such 
a form that it redissolved rather slowly in the soil moisture, and drying 
also rendered the solid organic matter more impervious to moisture and, 
Fig. 4.—Graphs of the quantity of carbon evolved as carbon dioxid in soils receiving various amounts of 
manure used alone and in combination with lime. Period, 1-39 days. 
hence, to bacterial action. Perhaps the main reason is that the easily 
available organic matter of the well-rotted manure had all been decom¬ 
posed. 
On comparing for the moment the curves in figures 6 and 7 with the 
curves for the similarly treated soils of the former experiment, shown 
in figure 2, it is seen that in the latter case where the fresh undried 
green manure was used, the rate of decomposition at first was enor¬ 
mously greater. Therefore the grinding had no effect on the green 
