Per cent 
of CO2 
2.4 
wo 
i 6 ° 
Nnwnoo Fb 
lCUHAUS COMIAG tO 
QRH SOHN &® ROO 
C—O i ) 
o 
Ss eS eS 
April 
Fic. 46. 
oo 
6 
3.4 
3.2 
3.0 
2.8 
2.6 
2.4 
ee: 
2.0 
1.8 
1.6 
14 
12 
1.0 
0.8 
0.6 
0.4 
0.2 
Fig. 47. 
Plartts 6 17Ches Hea// 
Tur Carson DIOXIDE OF THE Sort AIR 329 
Oo7 Cree. 
VO CQO + e+e 
paw 
Novrure 
FIorve stem 
May June July Aug. Oct. Novy. Dec. 
CARBON DIOXIDE IN AIR FROM DUNKIRK CLAY LOAM CROPPED TO OATS AND 
FROM THE SAME SOIL LEFT BARE, 1917 
Sept. 
Oa7 Ccroe 
WVo CTOO veseee IZ 
SSorographed 
oOrve sted 
Srature 
CARBON DIOXIDE IN AIR FROM DUNKIRK CLAY LOAM CROPPED TO OATS AND 
FROM THE SAME SOIL LEFT BARE, 1918 
