Analysis of experiments in square lattice with emphasis on variance components. II. Joint analysis

This paper focused on four alternatives of experiment group analysis in squ are lattice as far as the estimation of variance components and some geneti c parameters are concerned: 1) intrablock analysis with adjusted treatment and blocks within unadjusted repetitions; 2) lattice analysis as complete r andomized blocks; 3) intrablock analysis with unadjusted treatment and bloc ks within adjusted repetitions; 4) lattice analysis as complete randomized blocks, by utilizing the adjusted means of treatments, obtained from the an alysis with recovery of interblock information, having as mean square of th e error the mean of the errors (mean effective variance) of the individual analyses, of this same analysis with recovery of interblock information. Fo r the four alternatives of analysis, the estimators and estimates were obta ined for the variance components and heritability coefficients. The classif ication of material was also studied. The present study suggests that for e ach experiment and depending on the objectives of the analysis, one should observe which alternative of analysis is preferable, mainly in cases where a negative estimate is obtained for the variance component due to effects o f blocks within adjusted repetitions in the individual analyses.