SOME RELATIONS OF ORGANIC MATTER IN SOILS 21 
TABLE 8.. Ratios oF CARBON TO NITROGEN IN PLATS BEFORE AND AFTER 
TREATMENT. SERIES II, First Foor oF Soir 
Carbon-nitrogen ratios 
Plat Treatment Before treatment After treatment 
7202 Crop rotation 7.9:1 79:1 
Manure ake 
a Crop rotation : we 
12s Manure, lime tesloL 8.721 
7992 No vegetation 72:41 6.6:1 
Manure 
S No vegetation : : ; 
1209 Manure, lime 7.21 7.9:1 
eee Crop rotation with 
1205 legume 8.5:1 7.9:1 
Manure : 
te Crop rotation with 
7211 legume 91:1 See! 
Manure, lime 
7206 Grass : : 
Manure 8.8:1 9.5:1 
7212 Grass Sera (aa 
Manure, lime : mayo 
7214 Crop rotation 89:1 A 
Manure, K.SO, 85:1 
7215 CHO OEANOE 8.9:1 8.8:1 
Manure, K.SQO,, lime 
The plats in grass showed a decided increase in organic 
carbon and in nitrogen. 
The carbon-nitrogen ratios were lower than those in 
Series [. 
Removal of nitrogen from the soil in crops grown on the plats in 
Series IT 
The amounts of nitrogen removed in the crops grown on 
the plats of Series II were estimated and are recorded in table 
9. The nitrogen is expressed in pounds per acre. 
The results compare favorably with those obtained in the 
study of the plats in Series I. In considering the nitrogen in 
the soils of the plats in rotation with legumes, as recorded in 
