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NS sunflower hybrids are developed primarily for the Serbian agroecological conditions while taking into account the limiting factors of the domestic sunflower production. The 2006 sunflower yields were negatively affected by excessive soil moisture, high ground water levels, and floods occuring during the optimum period for sowing in nearly all sunflower-growing regions of the country. The increased moisture hampered planting and increased weediness, thus negatively affecting the yields. Weather conditions in the latter part of the vegetation period had a favorable effect on sunflower growth and development. Seed and oil yields obtained in a network of small-plot trials varied according to location and cultural practices used. In both of the sunflower regions studied in the paper, the highest seed yields were produced by the hybrids Sremac, NS-H-111 and NS-H-45. The highest oil yields in the trial network were obtained with the hybrids Baća, Pobednik, Olivko and Šumadinac. The hybrids Baća, NS-H-111 and Sremac produced the highest oil yields in the province of Vojvodina, while the hybridsŠumadinac, NS-H-111 and Stig did the same in central Serbia. In a two-year study in Vojvodina, the new hybrids Sremac, Šumadinac and Somborac proved their worth by producing higher seed yields than the hybrids commonly used in commercial production. Results of the small-plot trials confirmed the commercial value of the standard hybrids and showed the value of the new ones, which are expected to be come the main stays of sunflower production in the country as they gradually replace the currently predominant hybrids. [ABSTRACT FROM AUTHOR]