Data/hora: 11/06/2024 03:38:12

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 14/11/2019
Data da última atualização: | 13/11/2023
Autoria: | ZANATTA, J. A.; VIEIRA, F. C. B.; BRIEDIS, C.; DIECKOW, J.; BAYER, C.
Afiliação: | JOSILEIA ACORDI ZANATTA, CNPF; FREDERICO COSTA BEBER VIEIRA, UNIVERSIDADE FEDERAL DO PAMPA; CLEVER BRIEDIS, BOLSISTA NA EMBRAPA INSTRUMENTAÇÃO; JEFERSON DIECKOW, UNIVERSIDADE FEDERAL DO PARANÁ; CIMÉLIO BAYER, UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL.
Título: | Carbon indices to assess quality of management systems in a Subtropical Acrisol.
Ano de publicação: | 2019
Fonte/Imprenta: | Scientia Agricola, Piracicaba, v. 76, n. 6, p. 501-508, Nov./Dec. 2019.
DOI: | http://dx.doi.org/10.1590/1678-992X-2017-0322
Idioma: | Inglês
Conteúdo: | 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.
Palavras-Chave: | Agricultura conservativa; Conservation agriculture; No-till; Quality indicator.
Thesagro: | Carbono.
Thesaurus Nal: | Carbon; Cropping systems.
Categoria do assunto: | K Ciência Florestal e Produtos de Origem Vegetal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/204739/1/2019-Josileia-SA-Carbon.pdf
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (57086-1) - UPC - AP - DD -  -  -  - DIS