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Evaluation of lowland rice (Oryza spp.) varieties for tolerance to flooding in freshwater and estuarine agro ecosystems in Delta State

E.U. Uwuigbe, S.O. Akparobi, F.O. Oroka

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Int. J. Biosci.20(4), 70-84, April 2022

DOI: http://dx.doi.org/10.12692/ijb/20.4.70-84

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Abstract

The study was conducted to evaluate the best 21 identified rice varieties with the flood-tolerant trait in freshwater and estuarine environments. The experiment was a split-plot laid out in a Randomized Complete Block Design (RCBD) with three replications. The varieties by environmental interaction and stability estimate were investigated in four different environments; First Planting Estuarine (FPE)-E1, First Planting Freshwater (FPFW)-E2, Second Planting Estuarine (SPE) -E3 and Second Planting Freshwater (SPFW)-E4. Parameter accessed was Plant height (cm), Number of tillers, and Leaf diameter (cm), Days to 50% flowering, Days to 50% maturity, Number of panicle/plant, Number of grain/panicle, Harvest index, 1000 seed weight (g), Seed yields/plant(g), Seed yield (t/ha). Data collected were subjected to analysis of variance. The result showed that the partitioning of Genotype x Genotype x Environment through GGE biplot analysis showed that principal components I and II accounted for81.7% and 11.8% of GGE sum of squares, respectively, giving a total of 93.5% variation. The AMMI biplot showed a significant difference among varieties at (P<0.05) and Faro 44, Faro 4, Swana Sub 1, Faro 67, Faro 37, and Faro 66, giving the highest mean seed yield (t/ha) of 30.69t/ha, 30.36t/ha, 35.93t/ha, 34.73t/ha, 32.79t/ha and 32.64t/ha respectively in the winning environments E2 and E4. The study concluded Environments E2 and E4 as high yielding and stable and are therefore recommended to farmers for optimum yield.

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Evaluation of lowland rice (Oryza spp.) varieties for tolerance to flooding in freshwater and estuarine agro ecosystems in Delta State

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