Fig. 1 Contents of organic carbon and nitrogen in reddish paddy soil
under long-term winter planting green manure. A, content of organic
carbon. B, content of nitrogen. C, C/N ratio. R-R-WF, rice-ricefallow;
R-R-RP, rice-rice-rape; R-R-MV, rice-rice-Chinese milk
vetch; R-R-RG, rice-rice-ryegrass. The same as below.