PHYSICAL, CHEMICAL AND BIOLOGICAL ATTRIBUTES OF DYSTROPHIC RED OXISOL UNDER TWO CROP ROTATIONS

• Autor(a) principal: Fonseca, Graziella Carvalho
• Data de Publicação: 2007
• Outros Autores: Carneiro, Marco Aurélio Carbone, Costa, Adriana Rodolfo da, Oliveira, Geraldo César de, Balbino, Luiz Carlos
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Tropical (Online)
• Texto Completo: https://revistas.ufg.br/pat/article/view/1861
• topic: Soil density; microbial biomass; Densidade do solo; biomassa microbiana

The objective of this study was to evaluate the effect of two crop rotations on soil physical, chemical and biological attributes of a dystrophic red Oxisol. A randomized block design with split plot arrangement was used, with six replications. The treatments were two crop rotations, common bean/soybean + Brachiaria grass/common bean (F/S+B/F) and common bean/maize + Brachiaria grass/common bean (F/M+B/F), and a savannah area (";cerradão";) as reference, with soil samples at depths of 0-2.5 cm and 15-17.5 cm. The samples were collected in September 2004, at the common bean flowering stage. The attributes evaluated were: bulk density, total porosity, macroporosity, microporosity, average geometric diameter, average weighed diameter, aggregation greater than 2.0 mm, organic carbon, total nitrogen, microbial biomass carbon, and microbial quotient. The transition from ";cerradão"; to agricultural production, independent of crop rotation, increased soil bulk density and reduced total pore volume, macroporosity, organic carbon, total nitrogen, and microbial biomass carbon. The rotation F/S+B/F reduced soil bulk density and macroporosity, and increasing microporosity, average geometric diameter, average weighed diameter, aggregation greater than 2.0 mm, organic carbon, and total nitrogen, as related to the F/M+B/F rotation. KEY-WORDS: Soil density; microbial biomass.