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Vol. 12 No. 1 (2018)

Vegetable section

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

https://doi.org/10.17584/rcch.2018v12i1.7339

Published 2018-05-02

  • Luiz Henrique dos Santos
    • ,
  • Arcângelo Loss
    • ,
  • Cledimar Rogério Lourenzi
    • ,
  • Monique Souza
    • ,
  • Rogério Gonzatto
    • ,
  • Claudinei Kurtz
    • ,
  • Gustavo Brunetto
    • ,
  • Jucinei José Comin

Luiz Henrique dos Santos
Universidade Federal de Santa Catarina, Department of Rural Engineering, Postgraduate Program in Agroecosystems, Florianópolis-SC

Arcângelo Loss
Universidade Federal de Santa Catarina, Department of Rural Engineering, Postgraduate Program in Agroecosystems, Florianópolis-SC

Cledimar Rogério Lourenzi
Universidade Federal de Santa Catarina, Department of Rural Engineering, Postgraduate Program in Agroecosystems, Florianópolis-SC

Monique Souza
Universidade Federal de Santa Catarina, Department of Rural Engineering, Postgraduate Program in Agroecosystems, Florianópolis-SC

Rogério Gonzatto
Universidad Federal de Santa María, Center of Rural Sciences, Graduate Program in Soil Science, Santa Maria-RS

Claudinei Kurtz
Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri), Ituporanga-SC

Gustavo Brunetto
Universidad Federal de Santa María, Center of Rural Sciences, Graduate Program in Soil Science, Santa Maria-RS

Jucinei José Comin
Universidade Federal de Santa Catarina, Department of Rural Engineering, Postgraduate Program in Agroecosystems, Florianópolis-SC

Abstract

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.

Keywords

Allium cepa L., cover plants, aggregation, humic acids, soil nitrogen, tillage system.

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