Yields of oilseed rape in habitat conditions of Podkarpackie Province

A b s t r a c t: The objective of the study was the estimation of yields of winter oilseed rape, cultivar Visby F1, in diversified habitat conditions of the Podkarpackie Province. The study showed that the average seed yield of winter oilseed rape amounted to 3.97 t ha–1. The highest yields of oilseed rape were obtained in Przecław and Skołoszów. Yields obtained in Boguchwała were significantly lower, but only in relation to those obtained in Przecław. The lowest yields of oilseed rape were obtained in Nowy Lubliniec. Oilseed rape plants attained technical ripeness the earliest in Przecław and Nowy Lubliniec, as compared to those grown in Skołoszów and Boguchwała. In the years of the study oilseed rape plants did not suffer from frost bite, the poorest overwintering being noted in Przecław. Infestation with black spot of cruciferous plants was at similar levels in the particular localities. Fat content in the seeds did not depend significantly on the habitat conditions. The highest fat yield per hectare was obtained in Przecław, significantly lower in Skołoszów and Boguchwała, and the lowest in Nowy Lubliniec. Overwintering of oilseed rape plants was the poorest in the season of 2015/2016, but in spite of that the yield of seeds amounted to 4.07 t ha–1. In the analysed years, oilseed rape plants attained their technical ripeness phase on similar dates. In 2015 fat content in seeds was the highest, nut fat yield per hectare was the lowest. In that year, the lowest level of infestation with black spot of coniferous plants was noted. On average, the highest seed yield and fat yield was obtained in 2017. K e y w o r d s: Brassica napus L. ssp. oleifera Metzg., soil-climate conditions, crude fat, seed yield, fat yield