Pesquisa Agropecuária Brasileira
On-line version ISSN 1678-3921
REGAZZI, ADAIR JOSÉ; SILVA, HEYDER DINIZ; VIANA, JOSÉ MARCELO SORIANO and CRUZ, COSME DAMIÃO. ANALYSIS OF EXPERIMENTS IN SQUARE LATTICE WITH EMPHASIS ON VARIANCE COMPONENTS: II. JOINT ANALYSIS. Pesq. agropec. bras. [online]. 1999, vol.34, n.11, pp. 1987-1997. ISSN 1678-3921. http://dx.doi.org/10.1590/S0100-204X1999001100003.
This paper focused on four alternatives of experiment group analysis in square lattice as far as the estimation of variance components and some genetic parameters are concerned: 1) intra-block analysis with adjusted treatment and blocks within unadjusted repetitions; 2) lattice analysis as complete randomized blocks; 3) intrablock analysis with unadjusted treatment and blocks within adjusted repetitions; 4) lattice analysis as complete randomized blocks, by utilizing the adjusted means of treatments, obtained from the analysis with recovery of interblock information, having as mean square of the error the mean of the errors (mean effective variance) of the individual analyses, of this same analysis with recovery of interblock information. For the four alternatives of analysis, the estimators and estimates were obtained for the variance components and heritability coefficients. The classification of material was also studied. The present study suggests that for each 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 of blocks within adjusted repetitions in the individual analyses.
Keywords : genetic parameters; plant breeding.