Número de repetições para avaliação de caracteres de produção, fenologia e morfologia de cultivares de feijão

Filho, Alberto Cargnelutti; Ribeiro, Nerinéia Dalfollo

doi:10.1590/s0103-84782010001200002

Cited by 5 publications

(9 citation statements)

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“…Além da produtividade de grãos, o dimensionamento do número de repetições para avaliar outros caracteres de feijão (Cargnelutti & Ribeiro, 2010), de soja (Cargnelutti & Gonçalves, 2011) e de milho (Cargnelutti & Guadagnin, 2011) tem sido realizado a partir do coeficiente de repetibilidade. De maneira geral, nesses estudos foi evidenciado que, para a mesma precisão, há variabilidade do número de repetições entre caracteres.…”

Section: Introductionunclassified

Número de repetições para avaliação de caracteres em genótipos de feijão-caupi

et al. 2015

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ResumoO objetivo deste trabalho foi determinar o número de medições (repetições) necessário para avaliar caracteres de genótipos de feijão-caupi (Vigna unguiculata). Vinte genótipos de feijão-caupi de porte ereto e vinte de porte semiprostrado foram avaliados no Estado do Mato Grosso do Sul, em seis e quatro ensaios, respectivamente. Os dez ensaios foram conduzidos no delineamento blocos ao acaso, com quatro repetições. Foram mensurados os caracteres comprimento de vagem, massa de vagem, massa de grãos por vagem, número de grãos por vagem, massa de cem grãos e produtividade de grãos. Foram verificados os pressupostos do modelo matemático, realizada a análise de variância, estimado o coeficiente de repetibilidade e calculado o número de repetições. Ensaios com quatro repetições identificam genótipos superiores de feijão-caupi em relação aos caracteres comprimento de vagem, massa de vagem, massa de grãos por vagem, número de grãos por vagem, massa de cem grãos e produtividade de grãos, com, respectivamente, 84,57, 75,62, 73,14, 75,25, 81,53 e 79,19% de exatidão no prognóstico de seu valor real.Palavras-chave: Vigna unguiculata L., repetibilidade, planejamento experimental. Number of replicates for the evaluation of characters in cowpea genotypes AbstractThe objective of this study was to determine the number of measurements (replicates) necessary to predict the performance of cowpea (Vigna unguiculata) genotypes. Twenty genotypes of cowpea to growth habit erect and twenty semi-prostrate were carried out in Mato Grosso do Sul State, Brazil, in six and four trials, respectively. It was conducted ten trials in randomized complete blocks design with four replicates. The character length of pod, weight of pod, weight of grains per pod, number of seeds per pod, weight of hundred grains and grain yield were measured. Assumptions of the mathematical model were examined, analysis of variance was performed, the repeatability coefficient was estimated and the number of replicates was calculated. Trials with four replicates identify superior cowpea genotypes in relation to length of pod, weight of pod, weight of grains per pod, number of seeds per pod, weight of hundred grains and grain yield characters, with, respectively, 84.57, 75.62, 73.14, 75.25, 81.53 and 79.19% accuracy of the true prognostic value.

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Section: Introductionunclassified

Número de repetições para avaliação de caracteres em genótipos de feijão-caupi

et al. 2015

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“…The variability of r between traits and trials is particularly important in this study by representing different real situations that enable inferences regarding J, with overall applications. The variability of r and, subsequently, estimation of J between traits and trials were also observed in common bean Cargnelutti Filho and Ribeiro, 2010), soybean Cargnelutti Filho and Gonçalves, 2011), maize Cargnelutti Filho and Guadagnin, 2011), and irrigated rice (Cargnelutti Filho et al, 2012).…”

Section: Resultsmentioning

confidence: 78%

“…Therefore, we can infer that there was variability in the experimental accuracy between traits and tests but that, in general, these traits were evaluated under satisfactory experimental conditions. The variability of experimental accuracy, based on SA between traits and tests, has been verified in studies with common bean (Cargnelutti Filho and Ribeiro, 2010), soybean (Cargnelutti Filho and Gonçalves, 2011), maize (Cargnelutti Filho and Guadagnin, 2011), and irrigated rice (Cargnelutti Filho et al, 2012) genotypes.…”

Section: Resultsmentioning

confidence: 83%

“…The trials were conducted in a randomized block design with four replications. The number of treatments and blocks used in this study is similar to previous studies that have aimed to scale the number of repetitions necessary to evaluate important agronomic traits (Cargnelutti Filho and Ribeiro, 2010;Cargnelutti Filho and Gonçalves, 2011;Cargnelutti Filho and Guadagnin, 2011). Each plot consisted of two 5.0-m lines spaced 1.0 m apart.…”

Section: Methodsmentioning

confidence: 91%

“…Based on the coefficient of repeatability, scaling of the number of repetitions has been performed to evaluate agronomic traits of common bean (Cargnelutti Filho and Ribeiro, 2010), soybean (Cargnelutti Filho and Gonçalves, 2011), and maize (Cargnelutti Filho and Guadagnin, 2011). These studies generally revealed variability among traits in the number of repetitions required to obtain a given accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Number of repetitions for evaluating technological traits in cotton genotypes

et al. 2016

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ABSTRACT. With the changes in spinning technology, technological cotton traits, such as fiber length, fiber uniformity, fiber strength, fineness, fiber maturity, percentage of fibers, and short fiber index, are of great importance for selecting cotton genotypes. However, for accurate discrimination of genotypes, it is important that these traits are evaluated with the best possible accuracy. The aim of this study was to determine the number of measurements (repetitions) needed to accurately assess technological traits of cotton genotypes. Seven experiments were conducted in four Brazilian States (Ceará, Rio Grande do Norte, Goiás, and Mato Grosso do Sul). We used nine brown and two white colored fiber lines in a randomized block design with four replications. After verifying the assumptions of residual normality and homogeneity of variances, analysis of variance was performed to estimate the repeatability coefficient and calculating the number of repetitions. Trials with four replications were found to be sufficient to identify superior cotton genotypes for all measured traits except short fiber index with a selective accuracy >90% and at least 81% accuracy in predicting their actual value. These results allow more accurate and reliable results in future researches with evaluating technological traits in cotton genotypes.

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Experimental plan for tests with pea

et al. 2021

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Correct experimental planning is important to obtain more reliable data with high experimental precision. In this way, the results obtained and the technical recommendations generated are more reliable and representative. Thus, the objective of this work is to estimate the plot and sample sizes and the number of repetitions for the variables (a) number of pods per plant and (b) mass of pods per plant for pea (Pisum sativum L.) cultivation. Uniformity tests were carried in the years 2016, 2017, and 2018 in the experimental area of the Crop Science Department at Federal University of Santa Maria. The cultivar used was Pea Grain 40, which has an indeterminate growth habit, with a cycle of 75-90 d and a cylindrical pod. The plot size for evaluating the number of pods per plant and the mass of pods per plant for pea cultivation is eight and nine plants, respectively. The sample size for evaluating the number of pods per plant and the mass of pods per plant is eight plants in the direction of the line with a half-width of the 20% confidence interval of the mean. For the variables number of pods per plant and pod mass per pea plant, 10 and 12 repetitions are required, respectively, to evaluate up to 20 treatments in a randomized block design and in the incomplete blocks design with up to 100 treatments for significant differences of 35% between treatment averages. INTRODUCTIONThe pea (Pisum sativum L.) is an annual herbaceous legume, with cultivars classified as being of determined and indeterminate growth. Cultivars that show indeterminate growth are used for edible pods production, whereas cultivars with determined growth are used for grain production (Filgueira, 2008). Worldwide, in 2018, the production of dry pea occupied 7.88 million ha of cultivated area, with a production of 13.53 million tons; the largest producers are Europe (38.8%), North and South America (33.6%), Asia (20.5%

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Número de repetições para avaliação de caracteres de produção, fenologia e morfologia de cultivares de feijão

Cited by 5 publications

References 10 publications

Número de repetições para avaliação de caracteres em genótipos de feijão-caupi

Número de repetições para avaliação de caracteres em genótipos de feijão-caupi

Number of repetitions for evaluating technological traits in cotton genotypes

Experimental plan for tests with pea

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