The objective of this study was to assess the experimental precision when using correction methods for experimental plot yields and the influences of these methods on the comparison and indication of maize cultivars by the method of Annicchiarico (1992). Thirty-three cultivars were evaluated in three replications in randomized blocks in eight environments, with plot yields being analysed without correction (SC) and corrected by the methods of covariance to the ideal stand (COVI) and by the stratified correction (CE). There was a reduction in the coefficient of variation with the yield adjustment, improving the efficiency of the experiments. The methods COVI and CE were consistent in the correction of the yield for the indication of cultivars. The data adjustment affected the cultivar indication.
Zea mays L.; experimental precision; statistical analysis; cultivar indication; yield correction
