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Fig. 3. The relationship between the amount of humic acid (HA) N mineralized and the optical density at 465 nm for the mobile humic acid (MHA) fraction and the calcium humate (CaHA) fraction that were extracted from seven tropical lowland rice soils and incubated in the (a) Tanhoi and (b) IRRI soils under anaerobic conditions at 30°C for 3 and 6 wk. ** indicates significance at 1% level.