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Physical attributes and organic material in pastures of Brachiaria brizantha at degradation levels
Rocha Junior, Paulo Roberto da; Donagemma, Guilherme Kangussú; Andrade, Felipe Vaz; Passos, Renato Ribeiro; Balieiro, Fabiano de Carvalho.
Afiliação
  • Rocha Junior, Paulo Roberto da; Bioversa. Borborema. BR
  • Donagemma, Guilherme Kangussú; Empresa Brasileira de Pesquisa Agropecuária. Rio de Janeiro. BR
  • Andrade, Felipe Vaz; Universidade Federal do Espírito Santo. Alegre. BR
  • Passos, Renato Ribeiro; Empresa Brasileira de Pesquisa Agropecuária. Rio de Janeiro. BR
  • Balieiro, Fabiano de Carvalho; Empresa Brasileira de Pesquisa Agropecuária. Rio de Janeiro. BR
Biosci. j. (Online) ; 38: e38008, Jan.-Dec. 2022. mapas, tab, graf
Article em En | LILACS | ID: biblio-1361640
Biblioteca responsável: BR396.1
ABSTRACT
Pastures cover, in Brazil, around 165 million ha, most of them are at some degradation level. Recovering these pastures is essential. The objective of this study was to evaluate the sensibility of soil organic matter (SOM) and its physical attributes in pasture soil at different degradation levels (1 to 4), Capoeiras (1 and 2) and secondary Forest (Control). Samples were collected at four depths (0.00-0.05, 0.05-0.10, 0.10-0.20 and 0.20-0.40 m). We verified higher values for SOM and hydraulic conductivity (Ko) in Forest, especially in the most superficial layer (0.00-0.05). We noted low values for macroporosity in this area. In all areas under Pastures lower values for Ko were observed in the superficial layer (0.00-0.05 m) when compared to layers 0.05-0.10 and 0.10-0.20 m, which indicates that the pasture management and cattle trampling negatively affect the physical quality of the pastures. For field capacity and wilting point the average values were observed in Pasture 4 (more degraded), which caused higher values for water availability. According to the principal components analysis, except for SOM at 0.20-0.40 m, all variables studied presented correlation above 0.6. From grouping analysis, we separated 3 groups Forest; Capoeiras 1 and Capoeira 2 and Pastures 1 to 4.
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Texto completo: 1 Bases de dados: LILACS Assunto principal: Qualidade do Solo / Características do Solo Idioma: En Revista: Biosci. j. (Online) Assunto da revista: Agricultura / Disciplinas das Ciˆncias Biol¢gicas / Pesquisa Interdisciplinar Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil

Texto completo: 1 Bases de dados: LILACS Assunto principal: Qualidade do Solo / Características do Solo Idioma: En Revista: Biosci. j. (Online) Assunto da revista: Agricultura / Disciplinas das Ciˆncias Biol¢gicas / Pesquisa Interdisciplinar Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil