Total nitrogen and humic substances in aggregates of soils with onion crops under no-tillage and conventional tillage systems

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 natural vegetation 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.

• Tipo de recurso: http://purl.org/coar/resource_type/c_7181
• Fecha de publicación: 2018
• Institución: Universidad Pedagógica y Tecnológica de Colombia
• Repositorio: RiUPTC: Repositorio Institucional UPTC
• Idioma: eng
• OAI Identifier: oai:repositorio.uptc.edu.co:001/16780
• Acceso en línea: https://revistas.uptc.edu.co/index.php/ciencias_horticolas/article/view/7339; https://repositorio.uptc.edu.co/handle/001/16780
• Palabra clave: Allium cepa L.; cover plants; aggregation; humic acids; soil nitrogen; tillage system.; SB320-353.5; S622-627; Allium cepa L.; plantas de cobertura; agregación; ácidos húmicos; nitrógeno del suelo; sistemas de labranza.; SB320-353.5; S622-627
• License: https://creativecommons.org/licenses/by-nc/4.0/