African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Soil carbon dioxide flux in a no-tillage winter system

Rafael Pivotto Bortolotto
  • Rafael Pivotto Bortolotto
  • Department of Soil Science, Federal University of Santa Maria (UFSM), Avenida Roraima, 100, 97105-900, Santa Maria, Rio Grande do Sul, Brazil.
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Telmo Jorge Carneiro Amado
  • Telmo Jorge Carneiro Amado
  • Department of Soil Science, Federal University of Santa Maria (UFSM), Avenida Roraima, 100, 97105-900, Santa Maria, Rio Grande do Sul, Brazil.
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Douglas Dalla Nora*
  • Douglas Dalla Nora*
  • Department of Soil Science, Federal University of Santa Maria (UFSM), Avenida Roraima, 100, 97105-900, Santa Maria, Rio Grande do Sul, Brazil.
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Cristiano Keller
  • Cristiano Keller
  • Department of Soil Science, Federal University of Santa Maria (UFSM), Avenida Roraima, 100, 97105-900, Santa Maria, Rio Grande do Sul, Brazil.
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Debora Roberti
  • Debora Roberti
  • Department of Soil Physics, Federal University of Santa Maria (UFSM), Avenida Roraima, 100, 97105-900, Santa Maria, Rio Grande do Sul, Brazil.
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Jackson Ernani Fiorin
  • Jackson Ernani Fiorin
  • Cooperativa Central Gaúcha Ltda Tecnologia (CCGL Tec), Estrada RS 342, Km 149, Caixa Postal 10, 98005-970, Cruz Alta Rio Grande do Sul Brazil/University of Cruz Alta (UNICRUZ), Rodovia Municipal Jacob Della Méa, Km 5, 98020-290, Cruz Alta, Rio Grande Sul, Brazil.
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Klaus Reichardt
  • Klaus Reichardt
  • Center for Nuclear Energy in Agriculture, University de São Paulo (CENA/USP), Avenida Centenario, 303, bairro São Dimas, caixa postal 96, 13400-970, Piracicaba, São Paulo, Brazil.
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João Fernando Zamberlan
  • João Fernando Zamberlan
  • University of Cruz Alta (UNICRUZ), Rodovia Municipal Jacob Della Méa, Km 5, 98020-290, Cruz Alta, Rio Grande Sul, Brazil.
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Mauricio Paulo Batistella Pasini
  • Mauricio Paulo Batistella Pasini
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Avenida Roraima, 100, 97105-900, Santa Maria, Rio Grande do Sul, Brazil.
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Rodrigo da Silveira Nicoloso
  • Rodrigo da Silveira Nicoloso
  • Embrapa Suínos e Aves, BR 153, Caixa Postal 21, 89700-000 Concórdia, Santa Catarina, Brazil.
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  •  Received: 02 December 2014
  •  Accepted: 22 January 2015
  •  Published: 05 February 2015

Abstract

Soil carbon dioxide flux is a complex process which depends on variations of different factors related to climate and soil. The objective of this study was identifying the abiotic factors that most contributed to this flux during different phonologic stages of the sequence black oat-vetch, cultivated under the no tillage system, in the winter, and find out the most important factors. Soil carbon fluxes were measured every 15 min with a LI-COR “long-term” (stationary) chamber, installed on the no tillage site of the rotation: soybean/black oat/soybean/black oat + vetch/corn/turnip/wheat. The factor that mostly influenced soil carbon fluxes was soil temperature, explaining 57% of the flux variation during the cycles of the crops and 80% from tillering to the begin of the elongation stage of the black oat. The phonologic stages of the black oat in the consortium black oat + vetch that mostly contributed to the carbon soil flux were from the begin of the tillering to the begin of the elongation, and from the elongation to massive grain of the black oat.

 

Key words: Greenhouse effect, soil temperature, phenologic stages, soil conservations system, Avena strigosa, Vicia sativa.