Genotype-Environment Interaction Study for Fodder Yield and Related Traits in Oat Genotypes (Avena sativa L.) by AMMI Analysis
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Date
2022-01
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The present investigation entitled “Genotype-Environment Interaction Study for Fodder Yield and Related Traits in Oat Genotypes (Avena sativa L.) by AMMI Analysis” was undertaken to assess the magnitude of genotype × environment interaction and performance stability in the fodder oat, during Rabi 2019-20. The thirty-one oat genotypes including a check were planted in RCBD design under rainfed conditions with two dates of sowing at two different locations. Each entry was represented by a plot size of 3 m2.
The additive main effects and multiplicative interaction, as well as the site regression GGE biplot, were used to estimate genotype × environment interaction and yield stability. For all characters studied (excluding crude protein), pooled analysis of variance revealed significant (p < 0.05) differences among genotypes, environments and genotype-environment interaction effects. This indicated that the genotypes differentially responded to the changes in the test environments or the test environments differentially discriminated the genotypes or both. In green fodder yield, environment accounted for 21.01%, of total yield variance, genotype 52.96%, and G×E interaction 26.02%, emphasising the importance of spatial and temporal replication of variety trials. AMMI's first five bilinear terms were found to be significant. The first two multiplicative component terms sum of squares, with their cumulative degrees of freedom of 62, explained 91.12% of the interaction sum of squares.
The oat genotypes, G28 (Sabzar) and G1 (JHO-99-2) were found to be the most stable genotypes across environments, with higher mean green fodder yield, making them suitable for cultivation under both normal and late sowing conditions.
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