GRAIN AND OIL YIELD INVESTIGATED SUNFLOWER HYBRIDS DEPENDING ON THE GROWING SEASON

U četverogodišnjim poljskim pokusima (od 2001.-2004.) u zapadnoj Slavoniji (Nova Gradiška) istraživan je utjecaj vremenskih prilika (godine) i hibrida suncokreta na prinos sjemena i ulja. U pokusu je istraživano pet hibrida suncokreta: PR63A90, Alzan, Aleksandra, Opera i Pixel. Dobiveni rezultati istraživanja pokazali su da na prinos sjemena i ulja značajan utjecaj imaju vremenske prilike (godina), hibrid i njihova interakcija. Najveći prinosi sjemena i ulja po hektaru ostvareni su u godini u kojoj je tijekom srpnja palo 65 mm, a tijekom kolovoza 48 mm oborina, a prosječna relativna vlaga zraka tijekom vegetacije bila je ispod 70%. Visoki sadržaj ulja u sjemenu ostvaren je u godini s dovoljno vlage u tlu tijekom faze sinteze ulja, višom srednjom dnevnom temperaturom (21,7oC) u fazi intenzivne sinteze ulja, a nižom (14,1oC) u fazi usporene sinteze ulja. Značajno najveći prinos sjemena (3901 kg/ha) i ulja (1688 kg/ha) ostvaren je u 2003. godini, dok je najveći sadržaj ulja (54,94% u s. t.) ostvaren u 2001. godini. Po prinosu sjemena i ulja po hektaru najrodniji hibridi bili su: PR63A90 i Aleksandra. Najveći sadržaj ulja u sjemenu (51,56% u s. t.) imao je hibrid Opera.In four-year field experiments (2001-2004) conducted in Western Slavonia (Nova Gradiška) influence of weather conditions (year) and sunflower hybrids on grain and oil yield was investigated. In the experiments five sunflower hybrids (PR63A90, Alzan, Aleksandra, Opera and Pixel) were investigated. Obtained results have indicated that weather conditions, hybrid and their interaction have significant influence on grain and oil yield. The highest grain and oil yield per hectare were obtained in the year with 65 mm precipitation in July, 48 mm in August and relative air humidity during the sunflower vegetation below 70%. High oil content in seed was obtained in the year with sufficient soil moisture during the oil synthesis, higher mean air daily temperature (21.70C) in the stage of intensive oil sythesis, and lower (14.10C) in the stage of slower oil synthesis. Significantly the highest grain (3901 kg/ha) and oil (1688 kg/ha) yield were obtained in 2003 year, while the highest oil content (54.94% in d. m.) was obtained in 2001 year. According to grain and oil yield, the most productive hybrids were: PR63A90 and Aleksandra whereas the highest oil content in seed (51.56% in d. m.) had Opera hybrid