4 Tables; 12 ref. Summary (En)

Twenty early maturing, elite Maize (Zea mays L.) genotypes, comprising synthetics, top crosses, hybrids and improved lines, grown in about 20 environments (5 years and 4 locations) were tested for their adaptability, stability and drought responses in the semi-arid regions of the rift valley. Residual mean deviation square, b value and Drought Susceptibility Index models were employed. All genotypes including katumani (commercial variety of East Africa) were well adapted to moisture stress environment, although they would not be profitable if grown in high yielding environments. Stability across environments and yield were negatively correlated and hence, the most stable genotypes were relatively low yielding. Meanwhile, adapted genotypes were found to be highly stable. The variation in yield and stability among synthetics, hybrids and improved lines was not consistent. However, synthetic x line crosses were adaptive and stable while single crosses were high yielding. Seasonal yield variability and risk was the highest in Awassa and the lowest in Nazret. A synthetics named composite of best families was the best performer in moisture stress areas and was recommended for release

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