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Sunflower ( Helianthus annuus  L.) is a new edible oil crop in Sudan. Many production constraints are responsible for fluctuation in its production and productivity. The main constraint is a lack of adapted, improved, highyield sunflower varieties. Farmers depend on imported seeds, which are usually unavailable and expensive. To reduce the cost of the seed and ensure seed supply at the optimum time, ten single-cross sunflower hybrids (SFH32, SFH36, SFH37, SFH310, SFH313, SFH314, SFH341, SFH345, SFH302 and SFH325) and the hybrid Hysun-33 (the check) were evaluated for yield potential and yield components. The experiment was laid-out in a randomized complete block design with three replications carried over five irrigated locations during the winter season of 2008/2009. There was considerable variation for yield and its components among the hybrids and locations. Significant differences were observed for hybrids (G), locations (E) and G × E interaction. All the genotypes gave high seed and oil yields under irrigated conditions. Three hybrids, SFH310, SFH313 and SFH341, performed better than Hysun-33 and the other genotypes across five environments. Stability analysis identified SFH310, SFH313 and SFH341 as the most stable hybrids for seed and oil yields, since their regression coefficients were close to the value of one (b i =1) and had the lowest deviation from regression (S -2  di). In contrast, hybrids such as SFH32 and SFH37, with regression coefficients greater than one, were regarded as sensitive to environmental changes for seed and oil yields. The three promising hybrids were released last June for commercial production.

DEVELOPMENT AND STABILITY OF SOME SUDANESE SUNFLOWER HYBRIDS UNDER IRRIGATED CONDITIONS