The objective of this work was to verify whether the use of the Papadakis method in the analysis of the results of common bean cultivar trials modifies the assumptions of the mathematical model and the experimental precision indicators. Common bean yield data obtained from 26 cultivar trials carried out in randomized complete block design were used. For each trial, with or without the use of the Papadakis method, the assumptions were verified, the analysis of variance and the hypothesis tests were carried out, and statistics were calculated in order to identify experimental precision. The assumptions were not violated by either method (with or without the Papadakis method). The Fasoulas index increased from 5.9 to 13.9, and the selective accuracy from 0.82 to 0.89 with the Papadakis method. This method allowed the identification, with 80% precision, of superior common bean cultivars regarding grain yield using only four replicates, while seven replicates were necessary to maintain 80% precision in the analysis without the Papadakis method. The Papadakis method improves the indices of experimental precision and reduces the number of replicates necessary to predict the performance of common bean cultivars regarding grain yield.
Phaseolus vulgaris; spatial analysis; competition trials; precision indicators; assumptions
