Temporal evaluation of soil chemical attributes after slash-and-burn agriculture in the Western Brazilian Amazon

• Published in: Acta scientiarum. Agronomy Vol. 41; no. 1; pp. 42609 - e42609
• Main Authors: Silva Neto, Eduardo Carvalho da, Pereira, Marcos Gervasio, Frade Júnior, Elizio Ferreira, Silva, Sandra Bezerra da, Carvalho Júnior, João Andrade, Santos, José Carlos Dos
• Format: Journal Article
• Language: English
• Published: Maringa Editora da Universidade Estadual de Maringá - EDUEM 01-01-2019; Eduem (Editora da Universidade Estadual de Maringá)
• Subjects: Agriculture; Agrochemicals; AGRONOMY; Aluminum; amazonian agroecosystem; Ashes; Brasil; Calcium; Cations; cycling of nutrients; Deforestation; Forests; Magnesium; Organic chemistry; pH effects; Saturation; Shifting cultivation; Slash and burn; Soil chemistry; Soil fertility; Soil layers; soil management; Soils; Surface layers; Vegetation; Brazil; Brasil; cycling of nutrients; amazonian agroecosystem; soil management; soil fertility
• ISSN: 1679-9275; 1807-8621; 1807-8621
• DOI: 10.4025/actasciagron.v41i1.42609

In Amazonia, the main causes of deforestation are systems based on slash-and-burn agriculture. The objective of this work was to evaluate temporal changes in the soil chemical attributes after the vegetation has been slashed and burned in an area of native forest in the Western Amazon. For this study, four hectares of forest in Cruzeiro do Sul, State of Acre, Brazil, was slashed and burned. The soil in the study area was classified as Ultisol (Argissolo Amarelo Distrófico típico). Soil samples were collected over the course of one year, the first one being collected 16 hours after the burn and the others at 30, 60, 90, 150, 210, 270, and 360 days after the burn. The soil surface layers were more sensitive to fire action. Ashes from vegetation burn increased pH values, basic cations, and C values only in the first months, resulting in higher basal saturation values (V%). The practice of slash-and-burn after 12 months resulted in lower values of pH, Ca, Mg, K, and P and higher values of Al and H, as well as saturation by aluminum in the soil, indicating this practice contributes to the reduction of soil fertility.