African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 5890

Full Length Research Paper

Contributive effect of growth regulator Trinexapac-Ethyl to oats yield in Brazil

Anderson Marolli*
  • Anderson Marolli*
  • Department of Exact Sciences and Engineering, Regional University of the Northwest of Rio Grande do Sul State (UNIJUÍ), Lulu Ingenfritz Street, 480, 98700-000, RS, Ijuí, Brazil.
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Jose Antonio Gonzalez da Silva
  • Jose Antonio Gonzalez da Silva
  • Department of Agrarian Studies, Regional University of the Northwest of Rio Grande do Sul State (UNIJUÍ), Street of trade, 3000, 98700-000, RS, Ijuí, Brazil.
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Marcos Vinicios Romitti
  • Marcos Vinicios Romitti
  • Department of Natural and Exact Sciences, Federal University of Santa Maria (UFSM), Roraima Avenue, Building 13, Room 1123, 9105-900, RS, Santa Maria, Brazil.
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Rubia Diana Mantai
  • Rubia Diana Mantai
  • Department of Exact Sciences and Engineering, Regional University of the Northwest of Rio Grande do Sul State (UNIJUÍ), Lulu Ingenfritz Street, 480, 98700-000, RS, Ijuí, Brazil.
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Osmar Bruneslau Scremin
  • Osmar Bruneslau Scremin
  • Department of Exact Sciences and Engineering, Regional University of the Northwest of Rio Grande do Sul State (UNIJUÍ), Lulu Ingenfritz Street, 480, 98700-000, RS, Ijuí, Brazil.
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Rafael Zancan Frantz
  • Rafael Zancan Frantz
  • Department of Exact Sciences and Engineering, Regional University of the Northwest of Rio Grande do Sul State (UNIJUÍ), Lulu Ingenfritz Street, 480, 98700-000, RS, Ijuí, Brazil.
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Sandro Sawicki
  • Sandro Sawicki
  • Department of Exact Sciences and Engineering, Regional University of the Northwest of Rio Grande do Sul State (UNIJUÍ), Lulu Ingenfritz Street, 480, 98700-000, RS, Ijuí, Brazil.
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Emilio Ghisleni Arenhardt
  • Emilio Ghisleni Arenhardt
  • Department of Crop Plants, Federal University of Rio Grande do Sul (UFRS), Bento Gonçalves Avenue, 7712, 91540-000, RS, Porto Alegre, Brazil.
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Maria Eduarda Gzergorczick
  • Maria Eduarda Gzergorczick
  • Department of Agrarian Studies, Regional University of the Northwest of Rio Grande do Sul State (UNIJUÍ), Street of trade, 3000, 98700-000, RS, Ijuí, Brazil.
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Andressa Raquel Cyzeski de Lima
  • Andressa Raquel Cyzeski de Lima
  • Department of Agrarian Studies, Regional University of the Northwest of Rio Grande do Sul State (UNIJUÍ), Street of trade, 3000, 98700-000, RS, Ijuí, Brazil.
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  •  Received: 03 October 2016
  •  Accepted: 24 January 2017
  •  Published: 09 March 2017

Abstract

Studies on efficient use of the plant growth regulator can make this technology possible for leveraging oat yield in Brazil. This study aims to define the optimal dose growth regulator in oat, which allows plant lodging at most 5%. Establishing equations describe the yield indicators behavior and by using the optimal growth regulator dose for lodging, simulate the expression of these indicators regardless of reduced, high and very high conditions of nitrogen fertilization and favorable and unfavorable cultivation year. The study was conducted in 2013, 2014 and 2015, in carrying out two experiments, one to quantify the biomass yield and another aiming at estimating grain yield and lodging. The experimental design was a randomized block with four replications, following factorial scheme 4 x 3 to growth regulator doses (0, 200, 400 and 600 mL ha-1) and N-fertilizer rates (30, 90 and 150 kg ha-1), respectively. The use of 495 mL ha-1 growth regulator trinexapac-ethyl active principle is shown efficient at the reduction of oat plant lodging, regardless of the agricultural year condition and N-fertilizer rate. In the expression of grain yield and harvest index, quadratic behavior is obtained, however with decreasing linearity on the biomass yield and straw by increasing the growth regulator dose. The optimal dose of growth regulator in reducing oat lodging does not affect grain yield, but it reduces biological yield via biomass straw with elevation on the harvest index.

Key words: Avena sativa, biomass, straw, harvest index, multiple linear regression