Experimental alternatives for evaluation of progenies and clones in eucalyptus breeding programs

Souza, Elaine Aparecida de; Geraldi, Isaias Olívio; Ramalho, Magno Antônio Patto; Bertolucci, Fernando de Lelis Garcia

doi:10.1590/s0100-67622003000400002

Cited by 8 publications

(10 citation statements)

References 15 publications

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“…Alternativamente, diferentes métodos de análise espacial têm sido aplicados para aumentar a precisão experimental (Saez & Magaña, 1990;Vivaldi, 1990;Amaro et al, 1997;Souza et al, 2000;Souza et al, 2003;Costa et al, 2005). O método de Papadakis (Papadakis, 1937) tem proporcionado ganhos de precisão em ensaios com milho (Cargnelutti Filho et al, 2003), desde que se tenham facilidades computacionais.…”

Section: Introductionunclassified

Utilização do método de Papadakis na melhoria da qualidade experimental de ensaios com soja

Storck

Steckling²,

Roversi³

et al. 2008

Pesq. agropec. bras.

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Resumo -O trabalho teve como objetivo verificar as modificações na análise estatística, em relação ao atendimento aos pressupostos do modelo matemático e aos diferentes indicadores de precisão, que podem ser atribuídas à aplicação do método de Papadakis, na análise dos ensaios de competição de genótipos de soja. Foram usados os resultados da produção de grãos de soja de 226 ensaios de competição de genótipos, executados no delineamento de blocos completos ao acaso. Em cada ensaio, foram realizados: a verificação dos pressupostos, a análise da variância, os testes de hipóteses e outras estatísticas para identificação da precisão. Para verificar os ganhos em precisão, os mesmos dados foram analisados pelo método de Papadakis. Os pressupostos não foram violados em nenhum dos dois métodos de análise. A média do índice de diferenciação de Fasoulas aumentou de 5 para 12,43, em blocos homogêneos, e para 13,85, em blocos heterogêneos. O coeficiente de determinação, adequado para a classificação de precisão de experimentos, foi aproximadamente 10% superior com o uso do método de Papadakis, independentemente da eficiência do uso de blocos. A eficiência do método de Papadakis independe da eficiência do uso dos blocos e permite melhorias nos indicadores de precisão experimental.Termos para indexação: Glycine max, pressupostos, precisão experimental, análise espacial. Use of the Papadakis method to improve soybean trial qualityAbstract -The objective of this work was to verify the modifications in statistical analysis regarding the assumption fulfillment and the different precision indicators which can be attributed to the application of the Papadakis method, in the analysis of soybean grain yield experiments. The results of soybean yield of 226 trials of genotype competition, performed in a design of complete randomized blocks, were used. For each experiment, the assumptions were checked for: the variance analyses, hypothesis tests and other analysis to identify its precision. In order to verify the profit in precision, the same data were analyzed using the Papadakis method. The assumptions were adequate for both analysis types. The mean of Fasoulas differentiation index increased from 5 to 12.43, for homogeneous blocks, and to 13.85, for heterogeneous blocks. The determination coefficient, adequate to classify the precision of the experiments, was approximately 10% higher, when the Papadakis method was used, regardless the efficiency of block use. The efficiency of the Papadakis method does not depend on the efficiency of the blocks, and allows an improvement of the indicators of experimental precision.

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Section: Introductionunclassified

Utilização do método de Papadakis na melhoria da qualidade experimental de ensaios com soja

Storck

Steckling²,

Roversi³

et al. 2008

Pesq. agropec. bras.

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“…Esse resultado é indicativo de que o ajuste pela covariável estimada por esse método reduz a variabilidade e, portanto, reduzirá o erro experimental quando utilizada em análise de covariância, em experimento com tratamentos, o que também foi observado para outras culturas anuais (Cargnelutti Filho et al, 2003;Souza et al, 2003;Costa et al, 2005;Fox et al, 2007;Storck et al, 2008Storck et al, , 2009Storck et al, , 2010. Tabela 1.…”

Section: Resultsunclassified

“…], milho (Zea mays L.) e eucalipto (Eucalyptus urophylla S.T. Blake) (Cargnelutti Filho et al, 2003;Souza et al, 2003;Costa et al, 2005;Fox et al, 2007;Storck et al, 2008Storck et al, , 2009Storck et al, , 2010. Contudo, nesses trabalhos, não há consenso sobre a melhor vizinhança a ser utilizada para cálculo da covariável, o que é indicação de que a vizinhança varia entre culturas e diferentes condições de cultivo.…”

Section: Introductionunclassified

Effect of neighborhood and plot size on experiments with multiple-harvest oleraceous crops

Santos

Lúcio

Filho

et al. 2014

Pesq. agropec. bras.

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The objective of this work was to determine the efficiency of the Papadakis method on the quality evaluation of experiments with multiple-harvest oleraceous crops, and on the estimate of the covariate and the ideal plot size. Data from nine uniformity trials (five with bean pod, two with zucchini, and two with sweet pepper) and from one experiment with treatments (with sweet pepper) were used. Through the uniformity trials, the best way to calculate the covariate was defined and the optimal plot size was calculated. In the experiment with treatments, analyses of variance and covariance were performed, in which the covariate was calculated by the Papadakis method, and experimental precision was evaluated based on four statistics. The use of analysis of covariance with the covariate obtained by the Papadakis method increases the quality of experiments with multiple-harvest oleraceous crops and allows the use of smaller plot sizes. The best covariate is the one that considers a neighboring plot of each side of the reference plot.

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“…The VC value was determined for the RCBD (17.5%) and Papadakis method (11.0%) with variation in the number of neighboring plots in the covariate estimate (VOLLMANN et al, 2000). Progenies of Eucalyptus (121) of two ages were analyzed in two different locations, according to the lattice design (11x11), with three replicates, and the Papadakis method efficiency was observed only when the lattice was also efficient (145%) (SOUZA et al, 2003). Thus, in this study, the precision gain due to the use of triple lattice was limited because high precision already existed in the analysis by use of the design in random complete blocks.…”

Section: Methods Of Analysismentioning

confidence: 99%

Methods of analysis and number of replicates for trials with large numbers of soybean genotypes

et al. 2017

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The aim of this study was to evaluate the experimental precision of different methods of statistical analysis for trials with large numbers of soybean genotypes, and their relationship with the number of replicates. Soybean yield data (nine trials; 324 genotypes; 46 cultivars; 278 lines; agricultural harvest of 2014/15) were used. Two of these trials were performed at the same location, side by side, forming a trial with six replicates. Each trial was analyzed by the randomized complete block, triple lattice design, and use of the Papadakis method. The selective accuracy, least significant difference, and Fasoulas differentiation index were estimated, and model assumptions were tested. The resampling method was used to study the influence of the number of replicates, by varying the number of blocks and estimating the precision measurements. The experimental precision indicators of the Papadakis method are more favorable as compared to the randomized complete block design and triple lattice. To obtain selective accuracy above the high experimental precision range in trials with 324 soybean genotypes, two repetitions can be used, and data can be analyzed using the randomized complete block design or Papadakis method.

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Experimental alternatives for evaluation of progenies and clones in eucalyptus breeding programs

Cited by 8 publications

References 15 publications

Utilização do método de Papadakis na melhoria da qualidade experimental de ensaios com soja

Utilização do método de Papadakis na melhoria da qualidade experimental de ensaios com soja

Effect of neighborhood and plot size on experiments with multiple-harvest oleraceous crops

Methods of analysis and number of replicates for trials with large numbers of soybean genotypes

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