Evaluation of stand correction methods to estimate productivity in cornfields

The objective of this work was to determine the method of stand correction more adequate to estimate productivity in cornfields of 33 varieties in eig ht situations. The methods tested were: without correction, rules of three, method of Zuber, covariance of medium stand, covariance of ideal stand, pr oposed by Cruz, proposed by Vencovsky & Cruz, the method proposed in this w ork, which consisted of a stratified correction based on the combined produ ctivity for the characteristic stand, by Scott Knott's test. The methods pr oposed in this work, covariance of ideal stand and that proposed by Vencovs ky & Cruz were considered the most appropriate ones, because they presented lower values for the coefficient of variation and high value of F, which w as confirmed by the low values of P-i and P-i multivariate in the combined analysis. The methods rules of three and proposed by Cruz showed the highes t averages of productivity, which overestimate the real value of the averag e production. The method proposed in this work was efficient to correct the productivity of the com varieties, once the most productive varieties were also those with higher potential to leave descendants, measured by the ave rage stand.