medidas da precisão experimental em ensaios com genótipos de feijão e de soja measures of experimental precision in common bean and soybean genotype trials
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2009
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Abstract
O objetivo deste trabalho foi avaliar a adequação das estatísticas herdabilidade, coeficiente de determinação, valor do teste F para genótipo, índice de diferenciação de Fasoulas e acurácia seletiva, como medidas do grau de precisão experimental em conjuntos de ensaios de competição de genótipos de feijão (Phaseolus vulgaris) e de soja (Glycine max). Foram usados os dados de produtividade de grãos de 72 e 216 ensaios de competição de genótipos de feijão e de soja, respectivamente, realizados no Estado do Rio Grande do Sul. Com base em 12 estatísticas, estimadas para cada ensaio, foram realizadas análises de correlação, de trilha e de agrupamento, e foi calculada a frequência de ensaios em cada classe de precisão experimental. As estatísticas acurácia seletiva, herdabilidade, coeficiente de determinação e valor do teste F para genótipo são mais adequadas do que o coeficiente de variação e a diferença mínima significativa pelo teste de Tukey, em percentagem da média, para se avaliar a precisão experimental, em ensaios de competição de genótipos de feijão e de soja. Por essas estatísticas, 88,89% dos ensaios de competição de genótipos de feijão e 75% dos ensaios de competição de genótipos de soja apresentaram precisão alta ou muito alta. Contudo, 2,78 e 10,19% dos ensaios de competição de genótipos de feijão e de soja, respectivamente, poderiam ser descartados, em razão da insuficiência na precisão experimental.
The objective of this work was to evaluate the appropriateness of statistics heritability, determination coefficient, F-test value for genotype, Fasoulas index of differentiation and selective accuracy, as measures of the degree of experimental precision in a set of common bean (Phaseolus vulgaris) and soybean (Glycine max) genotype competition trials. Grain yield data from 72 genotype competition trials of common bean and 216 of soybean, carried out in Rio Grande do Sul state, Brazil, were used. Based on 12 statistics estimated for each trial, correlation, path and cluster analyses were done, and the trial frequency in each class of experimental precision was calculated. The statistics selective accuracy, heritability, coefficient of determination and F-test value for genotype are more adequate than the coefficient of variation and the significant minimum difference among cultivars by Tukey's test, expressed in percentage of the mean, to evaluate the experimental precision of common bean and soybean yield trials. According to those statistics, 88.89% of the common bean experiments and 75% of the soybean experiments showed a high or very high degree of precision, and 2.78% and 10.19% of the experiments of common bean and soybean, respectively, could be discarded due to insufficient experimental precision.
The objective of this work was to evaluate the appropriateness of statistics heritability, determination coefficient, F-test value for genotype, Fasoulas index of differentiation and selective accuracy, as measures of the degree of experimental precision in a set of common bean (Phaseolus vulgaris) and soybean (Glycine max) genotype competition trials. Grain yield data from 72 genotype competition trials of common bean and 216 of soybean, carried out in Rio Grande do Sul state, Brazil, were used. Based on 12 statistics estimated for each trial, correlation, path and cluster analyses were done, and the trial frequency in each class of experimental precision was calculated. The statistics selective accuracy, heritability, coefficient of determination and F-test value for genotype are more adequate than the coefficient of variation and the significant minimum difference among cultivars by Tukey's test, expressed in percentage of the mean, to evaluate the experimental precision of common bean and soybean yield trials. According to those statistics, 88.89% of the common bean experiments and 75% of the soybean experiments showed a high or very high degree of precision, and 2.78% and 10.19% of the experiments of common bean and soybean, respectively, could be discarded due to insufficient experimental precision.
| Reference Key |
filho2009pesquisamedidas
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| Authors | ;Alberto Cargnelutti Filho;Lindolfo Storck;Nerinéia Dalfollo Ribeiro |
| Journal | proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006 |
| Year | 2009 |
| DOI |
10.1590/S0100-204X2009001000003
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