Abstract

ARAUJO-VAZQUEZ, Hernando Alberto et al. Evaluation of sources of variation in multi-environment tests for yield and its components in cotton. rev.udcaactual.divulg.cient. [online]. 2021, vol.24, n.2, e1849.  Epub Dec 06, 2021. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v24.n2.2021.1849.

The assessment of the sources of variation of the combined analysis of variance in the multi-environment evaluation tests is of great importance in the selection of genotypes to recommend new cultivars for their adaptability and stability. The objective of this research was to evaluate the statistical significance and contribution of the sources of variation: environments, genotypes and genotype x environment interaction for cotton-seed yield, fiber percentage and fiber yield, in the dry and humid Colombian Caribbean zones. Data from two multi-environment tests per zone were used, where 10 different medium fiber genotypes were evaluated, under a randomized complete block design with four replications. Each test consisted of four experimentos carried out during the 2003/2004, 2007/2008 and 2009/2010 harvests. The results indicate that on average the environment was the most important source of variation in significance (p <0.05 and p <0.01) and variation (>64 %) of the combined analysis of variance for cotton-seed yield and fiber, with a similar trend in their behavior between them and in the two zones of the Colombian Caribbean. For the percentage of fiber in the dry Caribbean, the most important source of variation was genotypes (74.4 %) and in the humid Caribbean it was the environment (57.2 %). It is suggested to subdivide the two zones of the Caribbean into more environmentally homogeneous subzones and / or to increase the number of trials per test, to minimize the effect of the environment and the genotype x environment interaction.

Keywords : Gossypium hirsutum; Yield; Yield components; Agronomic evaluation; Combined analysis of variance; Colombian Caribbean.

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