Data/hora: 29/06/2024 11:08:54

Biblioteca(s): | Epagri-Sede.
Data corrente: | 04/11/2019
Data da última atualização: | 04/11/2019
Autoria: | SANTOS, L. H.; LOSS, A.; CANTON, L.; SOUZA, M.; FERREIRA, G. W.; KURTZ, C.; BRUNETTO, G.; LOURENZI, C. R.; LOVATO, P. E.; COMIN, J. J.
Título: | Carbon and nitrogen content in granulometric fractions of organic matter in soil aggregates under no-tillage and conventional tillage planting systems for onions.
Ano de publicação: | 2018
Fonte/Imprenta: | IDESIA , Chile, v. 36, p. 1-9, 2018.
Idioma: | Inglês

Conteúdo:

Carbon (C) and nitrogen (N) content in granulometric fractions of soil organic matter (SOM) are sensitive indicators of soil quality changes
caused by management systems. This study evaluated the C and N content in granulometric fractions of SOM of aggregates, an Inceptisol
under onion grown in no-till vegetable farming systems (NTVFS) and conventional tillage systems (CTS), comparing them to a secondary
forest. Treatments consisted of soil cover crops, monocropped and intercropped with onions grown under NTVFS: spontaneous vegetation,
100% black oats; 100% rye; 100% oilseed radish; oilseed (14%) + rye (86%) intercrop and oilseed (14%) + oats (86%) intercrop. The same
evaluations were also performed in an area with onions grown under CTS for ± 37 years, and in secondary forest (± 30 years). Undeformed
soil samples were collected from 0-5, 5-10, and 10-20 cm deep soil layers, and aggregates were subsequently separated (8.00 mm > Ø &#8805; 2.0
mm). Organic C (OC) and N of the granulometric fractions contents were quantified in aggregates, which were subdivided into particulate
fractions (POC and PN) and mineral-associated fractions (OCam and Nam). NTVFS promoted protection of SOM at the 0-5 cm depth
compared to CTS, as a result of higher POC content. Intercropped oats+oilseed and spontaneous vegetation contributed to an increase in PN
content compared to all other treatments under NTVFS. Monocropped and intercroppped oilseed radish caused an increase in Nam, which
was more effective than OCam to indicate differences among the systems. Conversion of areas from CTS to NTVFS promotes increases in
POC and PN content in the upper soil layer. NTVFS improves the quality of aggregates, and it may reduce damage caused by CTS

Palavras-Chave: | Allium cepa; Cover crops; intercropping; particulate carbon; particulate nitrogen.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_43771.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (104080-1) - UPC - AP - DD -  -  -  - DIS