ABSTRACT
This study was carried out to identify the yield stability and adaptability of the grain maize genotypes (parental inbred lines, F1-hybrids and check varieties), using Additive Main Effects and Multiplicative Interaction (AMMI). A field experiment was executed during the winter and summer seasons of 2009 and 2010 at two locations, Shambat and Elrawakeeb, Sudan. A split-plot design with three replications was used to layout the experiment. The inbred lines and their F1-hybrids were evaluated in the field under normal irrigation and water-stress conditions. The results showed that, highly significant differences were detected among genotypes, environments and for G×E interaction, indicated differential performance of genotypes over environments. Considering mean grain yield, and the Linear Regression parameters bi and S2d values jointly, the F1-hybrids 160×2, 160×3 and 6×3 gave above average mean of grain yield/ha and were most stable for grain yield/ha. AMMI analysis differentiated the genotypes (parental inbred lines and F1-hybrids), based on their grain yield, into different adaptation pattern and stability. Based on AMMI analysis, the F1- hybrids 66y×6 and 6×3 were highly stable with considerable high yield and adapted to favorable environments. However, the F1- hybrids 160×66y and 160×3 exhibited the highest mean grain yield/ha (4.1 tons and 3.5 tons, respectively), with slightly low interaction scores, hence they are regarded as superior hybrids.