Weather conditions during the blossoming period and their effect
on the yield of three cultivars of blackcurrant (Ribes nigrum L.)
Jan Grabowski*, Zdzisław Kawecki**, Anna Bieniek**, Zofia Tomaszewska**
**Department of Meteorology
**Department of Horticulture
**University of Warmia and Mazury
**Prawocheńskiego 21, 10957 Olsztyn, Poland
**email: anna.bieniek@uwm.edu.pl
This study presents the influence of major weather factors during the blackcurrant blossoming period
on the yields of the ‘Ojebyn’, ‘Titania’ and ‘Roodknop’ cultivars,
cultivated in Warmia (Olsztyn). The study was conducted for five years (20032007). Among the factors
analysed were the currant yield, the duration of the blossoming period, average daily air temperature,
the number of days with frost at the height of 2 m and at the ground level, total rainfall during
the blossoming period and the number of days with rainfall during the blossoming period.
The statistical analysis of particular weather factors has shown that the number of days with frost
contributed significantly to the yield of the fruit. A linear correlation analysis has shown
that the yield of the three examined cultivars of blackcurrant depended on variable weather conditions
during the blossoming period. The yield of the ‘Ojebyn’ cultivar was significantly correlated
with the duration of the blossoming period, the number of days with frost and the number of days with
rainfall. A significant correlation in the ‘Titania’ cultivar was found with the number of days
with frost and with the total amount of rainfall during the blossoming period. The fruit yield from
the ‘Roodknop’ cultivar in the fiveyear period under study depended only on one variable:
the duration of the blossoming period. The highest yield was obtained from the ‘Titania’ cultivar.
Grabowski J., Kawecki Z., Bieniek A., Tomaszewska Z., 2009. Weather conditions during the blossoming period and their effect
on the yield of three cultivars of blackcurrant (Ribes nigrum L.). Folia Horticulturae 21/2: 3542.
