SomME RELATIONS OF ORGANIC MATTER IN SOILS 23 
however, of both the limed and the unlimed plats in Series II 
are less than those in Series I. It may be pointed out here that 
the plats in Series II contained less organic carbon and nitrogen 
than the plats in Series I. This may indicate that there is some 
relation between organic carbon and nitrogen, and yields of 
crops. 
SS 
SOS) WITHOUT LIME 
| errey LIME 
Field 
weight 
Cbs.) 
600 
500 
400 
300 
200 
100 
0 
Plat 7202 7208 7205 7211 7206 7212 _ 1214 ‘7215 
Crop rotation Crop rotation Grass Crop rotation 
without with without 
legume legume legume, 
SEGSO)- 
Fic 2. TOTAL-PLAT YIELDS FOR EIGHT-YEARS PERIODS, SERIES II 
