Tamanho ótimo de parcela para ensaios com sorgo granífero em duas épocas de semeadura

Brum, Betânia; Lopes, Sidinei José; Storck, Lindolfo; Santos, Valdecir José dos; Benz, Vilson; Lovato, Cristina dos Santos

doi:10.1590/s0103-84782008000200003

Cited by 7 publications

(11 citation statements)

References 13 publications

(13 reference statements)

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“…Table 4 shows values for the estimates of d in accordance with the pre-established conditions. Analysing this table, significant decreases can be seen in the values of d (gains in experimental precision) with increases in the size of small plots, although this increase in precision is small with additional increases in the area of plots over a certain size limit, agreeing with the results obtained by various authors (BRUM et al, 2008;DONATO et al, 2008;HENRIQUES NETO et al, 2004;LÚCIO et al, 2011;LÚCIO et al, 2012;MARTIN et al, 2004;;SANTOS et al, 2012).…”

Section: Resultssupporting

confidence: 89%

Optimum plot size for experiments with the sunflower1

Alves¹,

Silva²,

Assis³

et al. 2015

Rev. Ciênc. Agron.

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-The aim of this study was to determine a suitable plot size for field experiments with the sunflower. An experiment was carried out in a randomised complete block design with 14 sunflower cultivars and 10 replications. The plots consisted of four rows, six metres in length, spaced 0.7 m apart with 0.3 m between plants. The working area of the plot (7.56 m 2 ), consisting of the two central rows, was divided into 12 basic units, each consisting of three plants per row (0.63 m 2 ), from where the yield of the sunflower seeds was obtained. Suitable plot size was estimated using the intraclass correlation coefficient method. The detectable difference between treatments was also estimated (d). The optimum plot size for the evaluation of grain yield in the sunflower was 2.52 m 2 (working area), considering a boundary of one row on each side. Greater gains in experimental precision (16%) with increases in plot size, occurred up to eight basic units (5.04 m 2 ) using seven replications. Increasing the number of replications and the plot size was more efficient in increasing experimental precision, than increasing the number of cultivars.

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Section: Resultssupporting

confidence: 89%

Optimum plot size for experiments with the sunflower1

Alves¹,

Silva²,

Assis³

et al. 2015

Rev. Ciênc. Agron.

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“…Na literatura é comum a obtenção de estimativas do valor de b superiores à unidade (BRUM et al, 2008;LOPES et al, 2005;LORENTZ et al, 2007;LORENTZ et al, 2010;LÚCIO et al, 2011;LÚCIO et al, 2012;MARTIN et al, 2007;OLIVEIRA et al, 2006;SANTOS et al, 2012;STORCK et al, 2006b;STORCK;BISOGNIN;OLIVEIRA, 2006 Através do método de Hatheway (1961), que determina o denominado tamanho conveniente de parcela, estimaram-se vários tamanhos de parcela dentre os quais o pesquisador poderá escolher aquele que melhor lhe convier, a partir de condições experimentais pré-definidas. Na Tabela 2 são apresentados os diferentes tamanhos convenientes de parcelas para avaliação do rendimento de grãos de cultivares de girassol, adotandose um nível de significância de 5% de probabilidade.…”

Section: Resultsunclassified

Size and shape of plots for experiments with the sunflower

Alves

Silva

Assis

2016

Revista Ciência Agronômica

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2RESUMO -Na experimentação agrícola, a utilização do tamanho e da forma adequada de parcela são técnicas experimentais importantes para aumentar a precisão do experimento. Assim, objetivou-se nesse trabalho determinar o tamanho e forma adequada de parcela para experimentação em campo com girassol. Para isso, o experimento foi conduzido em blocos completos casualizados com 14 cultivares de girassol em 10 repetições. As parcelas foram constituídas de quatro fileiras de seis metros de comprimento, espaçadas de 0,7 m e 0,3 m entre plantas. A área útil da parcela (7,56 m 2 ), composta das duas fileiras centrais, foi dividida em 12 unidades básicas, cada uma constituída por três plantas na fileira (0,63 m 2 ), obtendo-se o rendimento de grãos de girassol. O tamanho conveniente da parcela experimental foi estimado pelo método de Hatheway e a sua forma adequada foi determinada pelo método da informação relativa. O método de Hatheway permitiu estimar diversos tamanhos convenientes de parcelas, muitos de tamanhos aplicáveis para experimentos de avaliação de cultivares de girassol. Parcela no formato retangular 1 x 6 (fileira com dezoito plantas e 3,78 m 2 de área útil), foi considerada a forma adequada para avaliação do rendimento de grãos de cultivares de girassol e, também, foi menor que o tamanho geralmente indicado nas pesquisas com a cultura do girassol. Palavras-chave: Helianthus annuus L.. Método de Hatheway. Método da informação relativa.ABSTRACT -In agricultural experimentation, the use of the appropriate size and shape for the plot is an important experimental technique for increasing the accuracy of the experiment. The aim of this work therefore was to determine a suitable plot size and shape for field experimentation on the sunflower. To do this, the experiment was carried out in a randomised design of complete blocks, with 14 sunflower cultivars in 10 replications. The plots consisted of four rows, each of six metres in length, at a spacing of 0.7 m, with 0.3 m between plants. The working area of the plot (7.56 m 2 ) comprising the two central rows, was divided into 12 basic units, each consisting of three plants per row (0.63 m 2 ), to obtain seed yield in the sunflower. A suitable plot size was estimated using Hatheway's method, with an appropriate shape being determined by the method of relative information. Hatheway's method made it possible to estimate several convenient plot sizes, many of them suitable for experiments to evaluate sunflower cultivars. A 1 x 6 rectangular plot (a row with 18 plants and a working area of 3.78 m 2 ) was considered the appropriate shape for evaluating grain yield in sunflower cultivars, and was also smaller than the size usually found in research into the sunflower crop.

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“…There are several other factors that affect experimental precision, among them: the heterogeneity of the soil, the genetic material, number of environments utilized, sample size, and the management of the experiment (Martin et al, 2005;Storck et al, 2006;Brum et al, 2008;Cargnelutti Filho et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Various studies about experimental precision are reported in the literature in which the cultures utilized were: maize (Martin et al, 2005); sorghum (Brum et al, 2008); potato (Storck et al, 2011); soybean and bean, castor bean, crambe, turnip, rice (Carnelutti Filho et al, 2009, 2010, 2011a,b, 2012; peach . However, Cattapatti et al (2008) reported the only Brazilian study about experimental precision with popcorn, concluding that for pre-harvest traits, one can use 4 repetitions and 5 plants per plot.…”

Section: Introductionmentioning

confidence: 99%