Abstract
Electrochemical reactions are intensified by soil flooding, which changes the dynamics of nutrients and negatively affects plant growth. In this work, we aimed to evaluate the changes in the redox potential (Eh), pH and nutrient availability in a Haplic Gleysol soil from a floodplain of the Guama River, Belem, Para State. During the period of floods (61 days), samples soils were collected on alternate days and analyzed in dry and wet conditions. Flooding resulted in higher pH values and decreased Eh, which stabilized after 32 days of flooding and did not affect the values of total nitrogen. An increase in the concentrations of phosphorus, sulfur, iron, manganese, copper and zinc were observed, and they were subsequently reduced with time of submergence. The reduction of sulfur occurred at low Eh and pH values near neutrality. The results show that nitrogen and sulfur do not limit agricultural production in the lowland soils of the Guama River.
Highlights
The lowland soils of the Brazilian Amazon constitute one of the most important ecosystems of Brazil because of its biological productivity and biodiversity
The soil samples were classified as Haplic Gleysol (Embrapa, 2013) and collected 400 m from the Guamá River channel in the Amazon estuary in a high floodplain area (1o27’32.92” S and 48o25’55.12” W)
Extended waterlogging periods significantly reduced the redox potential, indicating a high reductive condition influenced by the intensification of oxidation-reduction processes, which causes an increase in pH
Summary
The lowland soils of the Brazilian Amazon constitute one of the most important ecosystems of Brazil because of its biological productivity and biodiversity. The wetland soils of the Guamá River, a tributary of the Pará River, have great economic importance for the state of Pará Because they have good natural fertility and are located in the vicinity of large urban centers, they benefit agricultural activities and contribute to improving the quality of life of the populations involved. Their natural fertility is associated with the large amount of suspended sediment in the river waters, which maintains the soil fertility level (Lima et al, 2001)
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