Optimum plot size and number of replications related to selective precision

Storck, Lindolfo; Lopes, Sidinei José; Lúcio, Alessandro Dal’Col; Filho, Alberto Cargnelutti

doi:10.1590/s0103-84782011000300005

Cited by 10 publications

(10 citation statements)

References 16 publications

(23 reference statements)

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“…Esses resultados estão de acordo com os relatados por Storck et al (2011), que concluíram que o tamanho de parcela pode ser estimado por meio da acurácia seletiva pré-fixada.…”

Section: Resultsunclassified

Tamanho de parcela e efeito de bordadura no melhoramento de Urochloa ruziziensis

Dias

Gonçalves

Sobrinho

et al. 2013

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a necessidade de bordadura e estimar o tamanho ótimo de parcela em experimentos para avaliação de Urochloa ruziziensis. Foram avaliadas a altura das plantas e a produção de massa verde de oito progênies de meio-irmãos de U. ruziziensis, em dois cortes. Utilizou-se o delineamento de blocos ao acaso, com quatro repetições e parcelas de 16 m 2 . Cada parcela foi subdividida em 32 estratos de 0,5 m 2 , sendo cada estrato considerado como uma unidade básica. Para determinar a necessidade de bordadura, foi realizada análise de variância, tendo-se considerado a posição da unidade básica na parcela. As estimativas do tamanho ótimo da parcela foram realizadas pelo método da máxima curvatura do coeficiente de variação e pelo método da reamostragem. O uso de bordaduras não altera o desempenho médio e a classificação das progênies de meio-irmãos avaliadas. O emprego de parcelas com 3 m 2 é suficiente para obter boa precisão experimental em experimento com progênies de meio-irmãos de U. ruziziensis.Termos para indexação: Brachiaria ruziziensis, melhoramento genético, planejamento experimental, precisão experimental. Plot size and border effect on breeding of Urochloa ruziziensisAbstract -The objective of this work was to assess the need for a border area and to estimate the optimum plot size in experiments for the evaluation of Urochloa ruziziensis. Plant height and green mass production of eight half-sib progenies of U. ruziziensis were evaluated in two cuttings. A randomized complete block design was used, with four replicates and 16 m 2 plots. Each plot was subdivided into 32 strata of 0.5 m 2 , with each stratum being considered as a basic unit. To determine the need for a border area, analysis of variance was carried out considering the position of the basic unit in the plot. Estimates of optimum plot size were made by the maximum curvature of the coefficient of variation method and by the resampling method. The use of borders does not affect the mean performance and classification of the half-sib progenies evaluated. The use of 3 m 2 plots is enough to obtain good experimental accuracy in an experiment with half-sib progenies of U. ruziziensis.

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“…Esses resultados estão de acordo com os relatados por Storck et al (2011), que concluíram que o tamanho de parcela pode ser estimado por meio da acurácia seletiva pré-fixada.…”

Section: Resultsunclassified

Tamanho de parcela e efeito de bordadura no melhoramento de Urochloa ruziziensis

Dias

Gonçalves

Sobrinho

et al. 2013

Pesq. agropec. bras.

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“…Coincidence in plot sizes obtained by the dispersions of these two parameters is of great importance because they have distinct estimators (Ramalho et al, 2012;Resende and Duarte, 2007). As a result, it is possible to obtain estimates of optimum plot size taking into account the coefficient of variation and selective accuracy, because they are good estimates of the experimental precision (Storck, Lopes, Lúcio, & Filho, 2011). In classification of the treatments using 50 plants, only two treatments were classified in the first group for Site 2, and five treatments were classified as best by the Scott-Knott grouping test for the joint analysis (Table 2).…”

Section: Resultsmentioning

confidence: 99%

Plot size for evaluation of Arabica coffee yield

et al. 2019

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In most cases, in genetic breeding of Arabica coffee, plot size is defined in an empirical manner. It is often based only on the experience of the breeders and the availability of resources, potentially leading to a reduction in precision. Therefore, the aim of this study was to estimate the size of the experimental plot for evaluation of coffee yield. We evaluated two experiments for validation of cultivars with 12 treatments set up in a randomized complete block design with three replicates and plots composed of 50 plants. Each plant was considered as a basic unit. Estimates of ideal plot size were made by maximum curvature of the coefficient of variation, linear-plateau segmented model and by the resampling methods. We discussed the variations in the parameter estimates for different plot sizes. Divergence was seen among the plot sizes estimated by the different methodologies. Increasing the number of plants per plot led to a higher experimental precision to the point that the increase was no longer significant. The plot size recommended for evaluating coffee production is from seven to 19 plants.

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“…For many planted species, there are studies seeking to identify the best size of the experimental plot and whether there is need for a border. In eucalyptus, this information was already obtained in some studies (ANDRADE et al, 2006;STORCK et al, 2011). ANDRADE et al (2006), for the purpose of charcoal production, sought to identify the best plot size based on evaluation of seven clones in separate experiments with four plot sizes.…”

Section: Introductionmentioning

confidence: 99%

Experimental strategies for clonal eucalyptus

Mendes

Rosse²,

Toledo

et al. 2014

Silvae Genetica

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The success of any forestry operation depends on the careful choice of the clones to be planted. At existing yield levels, the differences among clones are becoming smaller, leading to the need to use experimental strategies for a more successful choice. To obtain information in regard to better experimental strategies, data from two clonal tests of eucalyptus were used. One of the tests consisted of 35 clones and another of 48 clones. In both tests, the experimental plot consisted of 100 plants at commercial spacing (12 m2 per plant). The trait wood volume was evaluated, taking the relative position of the plant in the plot as a reference. The data were evaluated by different means, and it was observed that the use of border plot in clonal tests in eucalyptus is not necessary. Experimental accuracy with 15 to 20 plants is similar in comparison to the plot with 100 plants.

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Optimum plot size and number of replications related to selective precision

Abstract: Planning agricultural trials and evaluating their precision is important in determining the credibility of the results

Cited by 10 publications

References 16 publications

Tamanho de parcela e efeito de bordadura no melhoramento de Urochloa ruziziensis

Tamanho de parcela e efeito de bordadura no melhoramento de Urochloa ruziziensis

Plot size for evaluation of Arabica coffee yield

Experimental strategies for clonal eucalyptus

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