Influence of spatial variability and its implication in the evaluation of grain yield in common bean genotypes

Abstract

Well-designed field experiments are able to deal with spatial variability, resulting in accurate and useful information. However, it is known that there are variations in the experimental areas, in addition to those indirectly induced by driving practices. In this sense, the aim of this paper was to decompose the causes of variation, making it possible to verify the effect of the genotype x block interaction and its implications, in the evaluation of grain yield in fixed and segregating bean genotypes. The experiment was conducted in the field crop in the 2020/21 senson in Lages - SC. The treatments were composed by the genotypes: i) IPR88 Uirapuru x BAF35, in the F2 generation; ii) IPR88 Uirapuru x BAF35, in the F5 generation; iii) IPR88 Uirapuru parent and iv) BAF35 parent; arranged in a randomized block experimental design with more than one repetition per block, with 3 blocks and 4 repetitions per treatment in each block. With the grain yield data (g plot^-1), analysis of variance and decomposition of the causes of variation by orthogonal contrasts were performed. Analysis of variance showed significance for block, genotype and the genotype x block interaction (p<0.05). Similarly, the decomposition into genotypes within each block also revealed significance (p<0.05). In addition, the decomposition of the genotype variation in the different blocks showed a greater fraction of this sum of squares, present in only one block, being inherent mainly to the parents. Thus, the repletion use within the blocks made it possible to properly verify the spatial variation this the experiment, which is essential when applying the selection.