Data/hora: 26/06/2024 16:18:10

Biblioteca(s): | Epagri-Sede.
Data corrente: | 08/07/2018
Data da última atualização: | 08/07/2018
Autoria: | SANTOS, L. H.; LOSS, A.; LOURENZI, C. R.; SOUZA, M.; GONZATTO, R.; KURTZ, C.; BRUNETTO, G.; COMIN, J. J.
Título: | Total nitrogen and humic substances in aggregates of soils with onion crops under no-tillage and conventional system.
Ano de publicação: | 2018
Fonte/Imprenta: | REVISTA COLOMBIANA DE CIENCIAS HORTÍCOLAS, Bogotá, Colombia, v. 12, n. 1, p. 166-174, 2018.
Idioma: | Inglês

Conteúdo:

The objective of this study was to evaluate the soil total nitrogen (TN), and N contents in humic substances
(HS) of the organic matter in aggregates of soils cultivated with onion under no-till system for horticulture
(NTSH) and conventional tillage system (CTS), comparing with an area of forest. The evaluated treatments
were natural vegetation (control), 100% black oats, 100% rye, 100% oilseed radish, intercrop of oilseed (14%)
+ rye (86%), intercrop of oilseed (14%) + black oats (86%), area under CTS of onion for ±37 years, and area
with secondary forest for ±30 years. Five years after the NTSH implementation, undisturbed soil samples
from the layers 0-5 cm, 5-10 cm, and 10-20 cm were collected; these samples presented aggregate sizes between 2.0 mm and 8.00 mm. The TN, and N contents of the HS were subdivided into fulvic acids (N-FA), humic acids (N-HA), and humin (N-HU) fractions. The change from CTS to NTSH increases the TN and N-HU
contents in the 0-5 cm soil layer. The intercrop of oats and oilseed radish, used as soil plant cover species in
NTSH, presented a greater increase in N-HU (0-20 cm) than the other treatments. Black oats, and naturalvegetation presented a greater increased in N-HA, and N-FA contents, respectively, in the 10-20 cm layer, than the other treatments in NTSH and CTS. CTS with millet as soil plant cover presented a greater increase in N-FA (0-20
cm) contents than the NTSH treatments.

Palavras-Chave: | aggregation; Allium cepa L; cover plants; humic acids; soil nitrogen; tillage system.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_40950.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
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