Association of Agronomic Traits with Grain Yield of Lowland Rice (Oryza Sativa L.) Genotypes
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- Correlation, Direct Effect, Genotypic, Oryza Sativa Rice, Phenotypic
- Fentie, Dejen Bekis; Abera, Bayuh Belay; Ali, Hussein Mohammed
- Rice is a versatile crop globally, though it has relatively short history of production and research in Ethiopia. Hence, genetic improvement is highly important to increase the production and productivity of the crop, which needs understanding of traits association. The study was conducted during 2017/2018 main cropping season at Fogera, Ethiopia, to determine the magnitude of association of yield and yield attributed traits in 30 lowland rice genotypes. The experiment was laid out using randomized block design with three replications. Data were collected for 17 agronomic characters and significant differences were found among the genotypes for all studied characters. Grain yield ha-1 had positive and highly significant phenotypic and genotypic correlations with filled grains panicle-1, panicle weight, biomass yield and harvest index, but it had negative genotypic and phenotypic correlation with unfilled grains panicle-1 and thousand-grain weight; only the phenotypic correlations being significant. Biomass yield, harvest index, number of filled grains panicle-1 and panicle plant-1 exerted the highest positive direct effect on grain yield while days to flowering exerted negative direct effect on grain yield at both genotypic and phenotypic levels. These traits can be used as selection indices to grain yield of lowland rice.
Full text: IJRAS_973_FINAL.pdf