Spatial dependency of soil chemicals in production systems in the anthropogenic dark earth

Autor(es)

Rodrigues Soares, Marcelo Dayron ^[1] ; de Souza, Zigomar Menezes ^[2] ; Costa Campos, Milton Cesar ^[3] ; Moraes Tavares, Rose Luiza ^[4] ; da Cunha, Jose Mauricio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Amazonas, Rua 29 Agosto 786, BR-6980000 Humaita, Amazonas - Brazil

^[2] Univ Estadual Campinas, BR-13083970 Campinas, SP - Brazil

^[3] Univ Fed Paraiba, Rodovia BR 079, Km 12, BR-58397000 Areia, Paraiba - Brazil

^[4] Univ Rio Verde, Caixa Postal 104, BR-75901970 Rio Verde, Go - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CANADIAN JOURNAL OF SOIL SCIENCE; v. 101, n. 3, p. 532-542, SEP 2021.
• Citações Web of Science: 0

Resumo

In general, anthrosols refer to anthropic soils of high fertility, but the concentration of these nutrients may vary according to the occupation of indigenous people in the past or due to current soil use. This study aimed to evaluate the spatial variability of the chemical attributes of the soil in areas of guandu bean production and pasture and to compare with natural forest systems on anthropogenic dark earth (ADE). For this assessment, 88 sampling points were selected in the area with natural forest vegetation and pasture and 90 sampling points in an area of guandu bean production. Soil samples were collected from layers 0.00-0.05, 0.05-0.10, and 0.10-0.20 m. Chemical analyses of the soil were conducted to determine organic matter, pH, aluminium, soil acidity, phosphorus, potassium, calcium, magnesium, cation-exchange capacity, sum of bases, and base saturation (V%). Data were analyzed using descriptive statistics and geostatistics to sample range, and sample density was estimated for each attribute. Guandu bean showed high content of soil organic matter in relation to pasture in the superficial layer (0.00-0.05 m). Based on sample density, lower variability and higher spatial continuity were observed for guandu bean in relation to pasture and natural forest in the layers of 0.00-0.05 and 0.05-0.10 m. It was found that the use and continuous management of ADE areas alter the content and distribution of soil fertility and, in some cases, may even improve chemical attributes when compared with areas not used with agricultural crops. (AU)

• Processo FAPESP: 15/24280-8 - Qualidade física do solo em terras pretas arqueológicas transformadas e naturais
• Beneficiário: Zigomar Menezes de Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular