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Fig. 1. Daily rates of CH4 production for lowland rice soils taken from five farmers' fields for (a) the unamended control treatment during a 70-d pre-incubation plus an additional 20 d that corresponded to the post-spiking incubation, and during a 20-d incubation following spiking at 70 d with (b) glucose and (c) rice root exudates. From 0 to 70 d, trends in the control treatment were identical to those of the glucose and root exudate treatments (not shown). Vertical bars represent standard errors of three laboratory replicates. Units of the samplings from 0 to 24 h after spiking (inset graphs) are µg CH4 g –1 soil d–1.
