Author(s):

I Sudhir Kumar, Nagesh Patne and BS Vivek

Abstract: Maize is a versatile crop with wider genetic variability and is able to grow successfully in tropical, sub tropical and temperate agro-climatic conditions. Determining stable genotypes across environments is essential for realizing improved yields. A study was conducted in which fifty six yellow maize hybrids were evaluated for grain yield stability across four diversified environments of Andhra Pradesh viz., Vizianagaram, Peddapuram, Garikapadu, Reddipalli representing different agro ecological zones of Andhra Pradesh, India. Combined analysis of variance did show show highly significant differences for genotypes, environments and genotype by environment interactions based on AMMI analysis. Environments have significantly affected grain yields of hybrid maize which accounted for 64.7 per cent of the total variation in yield while the genotype by environment interaction accounted for 26.6 per cent. GGE was partitioned through GGE Biplot which depicted first two interaction principal component axes (IPCA) contributing about 84.0 percent (48.4% and 35.6% by IPCA1 and IPCA2 respectively) of the grain yield variation due to genotype and genotype by environment interaction (GGE). Contribution of 8.7 percent by the genotypes indicates least contribution of genotypes to the total variation in the multi environment trials. The mean grain yield over environments ranged from 5747 kg/ha (CAH163) to 3628 kg/ha (CAH1542) with a grand mean of 4710 kg/ha. Out of fifty six hybrids, 29 hybrids had above the mean average yields. The present study revealed Peddapuram and Vizianagaram are the most discriminating environments among the four and most representative due to their longest distance from the origin of the biplot. Genetic differentiation of experimental hybrids is best demonstrated in the representative environments.

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