Data/hora: 01/06/2024 08:34:06

Biblioteca(s): | Epagri-Sede.
Data corrente: | 25/11/2021
Data da última atualização: | 25/11/2021
Autoria: | BORTOLINI, J. G.; SOARES, C. R. F. S.; MULLER, M. J.; FERREIRA, G. W.; MEYER, E.; VIEIRA, C. K.; SOUZA, M.; KURTZ, C.; LOURENZI, C. R.; LOVATO, P. E.; LOSS, A.; COMIN, J. J.
Título: | Soil Carbon, Glomalin, And Aggregation in Onion Crop Under No-Tillage with Cover Crops or Conventional Tillage Systems for Eight Years.
Ano de publicação: | 2021
Fonte/Imprenta: | Journal of Agricultural Studie, Las Vegas, v. 9, n. 2, p. 130-150, 2021.
Idioma: | Inglês

Conteúdo:

Crop systems using cover crops affect soil physical, chemical, and biological attributes,
including aggregate formation. This work aims to evaluate winter cover crop species' effect
on soil total organic carbon, glomalin, and aggregation in areas with onion crops in a
no-tillage vegetable production system (NTVS) and conventional tillage system (CTS) for
eight years. The experiment treatments were: control, with natural vegetation(NV); black oats
(Avena strigosa); rye(Secale cereale);oilseed radish(Raphanus sativus);intercropped black
oats and oilseed radish; intercropped rye and oilseed radish; and a conventional tillage
systems area. A 33-year old adjacent secondary forest was evaluated as a reference for
undisturbed conditions. We assessed soil total organic carbon, total glomalin, and easily
extractable glomalin in three soil layers (0-5, 5-10, and 10-20 cm depth). Undisturbed
samples were used to quantify soil aggregate stability, aggregation indexes (weighted mean
diameter; geometric mean diameter), aggregate mass distribution (macroaggregates,
mesoaggregates), and macroaggregate carbon contents. The conventional tillage areas had the
lowest weighted mean soil aggregate diameter, geometric mean diameter, and
macroaggregate mass. Those areas also had the lowest bulk soil and aggregate organic carbon
contents and the lowest total and easily extractable glomalin. Winter cover crops' use resulted
in a 10% higher aggregate weighted mean diameter and geometric mean diameter. Areas with
cover crops had 13% higher organic carbon contents in aggregates and 17% higher
macroaggregate mass than conventional tillage areas. The highest values of total and easily
extracted glomalin occurred in plots with black oats. Winter cover crops, single or
intercropped, improved physical attributes of soils with onion crops under not-tillage
compared to conventional tillage areas.

Palavras-Chave: | aggregate stability; bulk soil; chemical and biological attributes; geometric mean diameter; soil physical attributes.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_50366.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (106472-1) - UPC - AP - DD -  -  -  - DIS