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Determining the relationships between yield and yield attributes in sunflower

Relationships between seed yield and agronomic characters in sunflower were investigated without considering genetic effects. Sunflower hybrids were evaluated in 3 categories: Constant hybrids, control hybrids (mostly the same in each year), and test hybrids (changing each year). | Turk J Agric For 31 (2007) 237-244 © TÜB‹TAK Determining the Relationships between Yield and Yield Attributes in Sunflower Yalç›n KAYA, Göksel EVC‹, Sezgin DURAK, Veli PEKCAN, Tahir GÜCER Trakya Agricultural Research Institute, PO Box: 16, 22100 Edirne - TURKEY Received: 04.10.2006 Abstract: Relationships between seed yield and agronomic characters in sunflower were investigated without considering genetic effects. Sunflower hybrids were evaluated in 3 categories: constant hybrids, control hybrids (mostly the same in each year), and test hybrids (changing each year). Seed yield was positively correlated with oil content, plant height, and 1000-seed weight, but flowering and physiological maturity period correlated negatively with yield based on the analyses in this research. A diverse relationship was determined between the seed yield of the hybrids and oil content. Results of the regression analysis indicated that, up to 40%-45% oil content, there was a negative correlation between yield and oil content, but both values increased equivalently after this point. Up to 70 g 1000-seed weight, sunflower seed yield increased, but hybrids would sacrifice yield performance to get larger size seeds after this point. Seed yield gradually increased with increasing plant height and earlier maturing hybrids demonstrated higher yield performance in this research. The relationships between seed yield and other components gave similar results in the same climatic conditions, except Tarsan-1018 and Sanbro hybrids with respect to each characteristic observed. Key Words: Sunflower, hybrid, seed yield, yield traits, regression analysis Ayçiçe¤inde Verim ve Verim Ö¤eleri Aras›ndaki ‹liflkilerin Belirlenmesi Özet: Araflt›rmada; ayçiçe¤inde tane verimi ve verim ö¤eleri aras›nda iliflkiler, genetik katk› dikkate al›nmaks›z›n incelenmifltir. Bu çerçevede ayçiçe¤i hibritleri, en çok ekilen iki hibrit, genelde her y›l denemelerde yer alan kontrol çeflitleri ve her y›l de¤iflen aday hibritler