African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

Basic experimental unit and plot sizes with the method of maximum curvature of the coefficient of variation in sunn hemp

Giovani Facco
  • Giovani Facco
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Alberto Cargnelutti Filho
  • Alberto Cargnelutti Filho
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Bruna Mendonça Alves
  • Bruna Mendonça Alves
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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André Lavezo
  • André Lavezo
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Diego Nicolau Follman
  • Diego Nicolau Follman
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Cláudia Marques de Bem
  • Cláudia Marques de Bem
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Denison Esequiel Schabarum
  • Denison Esequiel Schabarum
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Jéssica Andiara Kleinpaul
  • Jéssica Andiara Kleinpaul
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Gabriela Görgen Chaves
  • Gabriela Görgen Chaves
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Daniela Lixinski Silveira
  • Daniela Lixinski Silveira
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Fernanda Martins Simões
  • Fernanda Martins Simões
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Daniela Barbieri Uliana
  • Daniela Barbieri Uliana
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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Cleiton Antonio Wartha
  • Cleiton Antonio Wartha
  • Department of Plant Science, Federal University of Santa Maria (UFSM), Santa Maria, RS, Brazil.
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  •  Received: 10 October 2016
  •  Accepted: 03 January 2017
  •  Published: 09 February 2017

Abstract

The influence of the basic experimental unit size on the plot size estimation determined by the method of maximum curvature of the coefficient of variation model is unknown in sunn hemp. This study aimed to verify the influence of the basic experimental unit (BEU) size in the estimate of the optimum plot size obtained by the method of maximum curvature of the coefficient of variation model for the evaluation of fresh matter of sunn hemp (Crotalaria juncea L.). Fresh matter of sunn hemp at the flowering was evaluated in uniformity trials in two sowing dates. In each sowing date, 4,608 BEU of 0.5 × 0.5 m (0.25 m2) were evaluated and 64 BEU plans were formed with sizes from 0.25 to 64 m2. In each evaluation period for each BEU plan, the first order spatial autocorrelation coefficient, variance, standard deviation, mean, coefficient of variation of the trial and the plot size were determined with the fresh matter data. For each BEU plan, the optimum plot size was determined by the method of maximum curvature of the coefficient of variation model. The estimate of optimum plot size depends on the basic experimental unit size. Determining the plot size to assess the fresh matter in basic experimental units as small as possible is recommended in order to prevent overestimation of the plot size and to contemplate all existing variability.

Key words: Crotalaria juncea L., experimental design, basic experimental unit.