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AUTHOR(S): Joseph Awomi, Umesh C. Kalita, B. Jaysankar Reddy, Partha P. Behera
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ABSTRACT A field experiment was conducted during the 2020–21 Boro (spring rice) season to evaluate grain yield stability in 12 rice (Oryza sativa L.) genotypes under varying NPK doses and sowing dates, using randomized block design (RBD). The study aimed to analyze genotype × environment (G × E) interactions through AMMI (Additive Main Effects and Multiplicative Interaction) and GGE (Genotype and Genotype × Environment) biplot models. AMMI analysis explained 61.1% of the total G × E variance, with the first interaction principal component (IPC1) and second interaction principal component (IPC2) accounting for 33.6% and 27.5% of the variation, respectively. G3 contributed the most to the interaction, followed by G9, G2, G5, and G4. The AMMI 1 biplot revealed G7 as the most stable and high-yielding genotype, followed by G1, G11, G10, and G12. The GGE biplot analysis explained 72.67% of the total variance through two principal components, PC1 (52.88%) and PC2 (19.79%). Among the environments, E6, E7, and E5 were identified as the most stable, while E2, E4, E8, E1, and E3 were more variable. Based on both AMMI and GGE analyses, genotypes G7, G1, G11, G10, and G12 were identified as the most stable and high-yielding. Genotype G7 showed specific adaptation to high NPK doses in the second sowing date (E7 and E8) and is recommended for late sowing under high-input management. Genotype G1 demonstrated suitability for low NPK doses across both early and late sowing dates (E1, E2, E5, and E6). This study provides insights into genotype performance and stability, aiding in targeted recommendations for sustainable rice production. |
KEYWORDS Boro rice, AMMI analysis, GGE biplot, genotype × environment interaction, grain yield stability, NPK dose, sowing dates, rice genotypes |
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Cite this paper Joseph Awomi, Umesh C. Kalita, B. Jaysankar Reddy, Partha P. Behera. (2025) Grain yield stability analysis of Boro rice (Oryza sativa L.) using AMMI and GGE biplot models under varying sowing dates and NPK doses in the Upper Brahmaputra region of Assam. International Journal of Agricultural Science, 10, 77-83 |
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