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Provedor de dados:  Repositório Alice
País:  Brazil
Título:  Carbon indices to assess quality of management systems in a Subtropical Acrisol.
Autores:  ZANATTA, J. A.
Data:  2019-11-14
Ano:  2019
Palavras-chave:  Conservation agriculture
Quality indicator
Agricultura conservativa
Cropping systems
Resumo:  Management systems to improve soil quality are essential for agricultural and environmental sustainability. We assessed the quality of soil management systems applied to a subtropical Acrisol in terms of the carbon management index (CMI), the stratification ratio for total organic carbon (SR-TOC) and light fraction of organic matter (SR-LF). In addition, we examined their relationship to chemical, physical and biological soil quality indicators, as well as to maize yield. The study was conducted on a long-term experiment (18 years) in southern Brazil involving two different systems [no tillage (NT) and conventional tillage (CT)], two cropping systems [black oat/maize (O/M) and black oat + vetch/maize + cowpea (OV/MC)] and two nitrogen fertilizer rates for maize (0 and 180 kg ha?1). Based on the three indices, the best managements for soil quality comprised NT (50-212 % better than CT), legume cover crops (10-47 % better than O/M) and N fertilization (8-33 % better than no fertilizer). All three indices proved accurate to assess the impact of soil management systems, especially SR-LF, which showed increased sensitivity and close relationships with chemical, physical and biological soil quality indicators. On the other hand, a poor relationship was observed between soil C indices and maize yield, which was improved only by legume cover crops and N fertilization. The results showed that the association of no-till system to an abundant supply of crop residues is key to ensure high soil quality and crop yields in humid subtropical regions.
Tipo:  Artigo de periódico
Idioma:  Inglês
Identificador:  Scientia Agricola, Piracicaba, v. 76, n. 6, p. 501-508, Nov./Dec. 2019.
Direitos:  openAccess

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