Tamanho de amostra de caracteres de cultivares de feijão

Filho, Alberto Cargnelutti; Ribeiro, Nerinéia Dalfollo; Storck, Lindolfo; Jost, Evandro; Poersch, Nerison Luís

doi:10.1590/s0103-84782008000300007

Cited by 19 publications

(18 citation statements)

References 7 publications

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“…Several authors have investigated improvements in experimental accuracy in common bean experiments in relation to the sample size of plants traits (CARGNELUTTI FILHO et al, 2008), to the use of borders in plots (RIBEIRO et al, 2001), and to the number of replications .…”

Section: Resultsmentioning

confidence: 99%

Repeatability reveals to be a useful method to evaluate the quality of an experiment with common beans

Gurgel¹,

Peixoto²,

Bhering³

et al. 2017

Biosci. J.

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Field experiment should be carried out with high accuracy since the discarding of a trial involves waste of time and resources, and can mislead breeders in selecting inferior genotypes. The simulation of a large number of experiments with great variability of traits is the main strategy to assist breeders on how to perform the experiment. Therefore, the objective of this study was to evaluate two criteria to infer the experimental quality: Coefficient of Variation (CV) and repeatability coefficient. Experimental data from evaluations of common bean lines carried out in 104 experiments were used in this study. The simulation of the scenarios used the following parameters: number of cultivars, number of blocks, genetic variance, mean yield, and coefficient of variation. Two thousand replications for each scenario were simulated. Genotypes means were arranged in an order, and the Spearman correlation was obtained between the estimated genotypes mean and the true genotypic values. Results revealed that CV is not a reliable parameter to evaluate the quality of experiment in the field. In conclusion, repeatability coefficient is the parameter that defines the discarding criteria of evaluation experiments and the recommendation of cultivars, as long as the values for each response variable are established.

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Section: Resultsmentioning

confidence: 99%

Repeatability reveals to be a useful method to evaluate the quality of an experiment with common beans

Gurgel¹,

Peixoto²,

Bhering³

et al. 2017

Biosci. J.

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show abstract

“…Assim, as técnicas experimentais, como a adequação do delineamento quanto ao tamanho da parcela e ao número de repetições (RAMALHO et al, 1977;ZIMMERMANN, 1982;BERTOLUCCI et al, 1991;ESTEFANEL et al, 1993), o uso de bordaduras (RIBEIRO et al, 2001) e o tamanho de amostra (ESTEFANEL et al, 1996, CARGNELUTTI FILHO et al, 2008, devem ser revistas, pois são importantes para a melhoria da precisão experimental.…”

Section: Resultsunclassified

Número de repetições para a comparação de cultivares de feijão

2009

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“…Thus, using a sample size appropriate to the population characteristics is crucial when planning a research study. common bean (Cargnelutti Filho, Ribeiro, Storck, Jost, & Poersch, 2008). These studies estimate sample sizes adjusted to the characteristics of each crop.…”

Section: Introductionmentioning

confidence: 99%

Sample Size for Morphological Traits of Sunn Hemp

Schabarum¹,

Filho²,

Lavezo³

et al. 2017

JAS

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Sunn hemp (Crotalaria juncea L.) is an annual leguminous plant used for crop rotation, biomass formation, biological nitrogen fixation, and nematode control. To this end, sampling is an important tool owing to its advantages, such as low cost and fast data acquisition. This study aimed to determine the sample size required to estimate the mean morphological traits of sunn hemp and to assess sample size variability among traits, crop development stages, and sowing seasons. Two uniformity trials were performed in the field during the 2014/2015 harvest. Crops were sown in October and December on an experimental area of the Department of Crop Science at the Federal University of Santa Maria, Brazil. An area of 1,200 m 2 was allocated for each trial. Each trial was divided into 2 m × 2 m grids, which formed 25 rows and 12 columns. One plant was marked per plot, totaling 300 plants in each trial. Leaf number and plant height were assessed weekly. Stem diameter and root length were measured at flowering. Normality and randomness tests were performed on each trait. The sample sizes (plants number) were calculated for the confidence interval half-widths (estimation errors) of the 2, 4, …, 20% mean estimates. There is variability of the sample size (plants number) between morphological traits, crop development stages, and sowing seasons. When choosing a single sample size to evaluate the morphological traits of sunn hemp, at least 70 plants should be sampled for an accuracy of 10% and a 95% confidence level.

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Tamanho de amostra de caracteres de cultivares de feijão

Abstract: RESUMO O objetivo deste trabalho foi estimar o tamanho de amostra necessária para avaliar caracteres de cultivares de feijão (Phaseolus vulgaris L.) e verificar a variabilidade do

Cited by 19 publications

References 7 publications

Repeatability reveals to be a useful method to evaluate the quality of an experiment with common beans

Repeatability reveals to be a useful method to evaluate the quality of an experiment with common beans

Número de repetições para a comparação de cultivares de feijão

Sample Size for Morphological Traits of Sunn Hemp

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