Phosphorus dynamics in waterlogged soils and sediments is environmentally important and seems closely related to redox reactions of iron compounds. In order to verify the effects of liming and phosphorus fertilization on soil Fe and P contents, nine lowland soil samples from Minas Gerais, Brazil, were treated with two lime and six phosphorus rates. After an aerobic incubation period, the soil Fe and P concentrations were determined by ammonium-acetate, Mehlich-1 and ammonium-oxalate extractants. The soils were then waterlogged and the "anionic-paper-method" phosphorus content was periodically determined. It was verified that lime and phosphate tended to decrease Fe and increase P concentrations as determined by ammonium-acetate and Mehlich-1 extractions. In recently waterlogged samples, lime tended to increase the "anionic-paper" determined P, whereas the opposite occurred after a longer period of waterlogging for some soil samples.
flooded soils; extractants; anionic-paper