PL
Celem pracy było określenie wpływu warunków klimatycznych w czasie wegetacji na zawartość cukrów redukujących w genotypach ziemniaka. Materiałem badawczym było 268 genotypów ziemniaka. Badania prowadzono w latach 1999–2012. Zawartość cukrów redukujących w bulwach ziemniaka oznaczano po zbiorze. Stwierdzono, że warunki klimatyczne, takie jak temperatura powietrza i opady w II i III dekadzie września determinują zawartość cukrów redukujących w bulwach ziemniaka. Na podstawie równania regresji liniowej stwierdzono, że przy średniej temperaturze powietrza 12°C w II i III dekadzie września każde obniżenie temperatury o 1°C powoduje kumulację cukrów redukujących o około 0,6 mg·kg–1 świeżej masy bulw ziemniaka uprawianego na glebie klasy IVa (piasek gliniasty lekki o podłożu pseudobielicowym).
EN
The aim of the study was to determine the effect of climatic conditions during the growing season on the content of reducing sugars in potato genotypes. The study was conducted in 14 growing seasons in the years 1999–2012 on 268 potato genotypes. The content of reducing sugars in potato tubers after harvest was determined. The meteorological data came from the observation station located in Division Jadwisin of Plant Breeding and Acclimatization Institute close to experimental fi eld. The date included: an average air temperature and the amount of rainfall. It was found that the climatic conditions such as air temperature and rainfall in the second and third decade of September determined the content of reducing sugars in potato tubers. Decisive infl uence on the content of reducing sugars in potato tubers after harvest had air temperature and total precipitation in September – 10 days before harvest and during harvest (third decade of September). On the basis of correlation coeffi cients, it was found that the higher the temperature in the second and third decade of September, the lower the content of reducing sugars in the tubers (correlation coeffi cient r = –0.69, r = –0.71) and the lower raifall that the lower reducing sugars content was noticed (correlation coeffi cient in the second decade of September r = 0.75). On the base determination coeffi cients it was stated the relationship of the feature on the level about 50% (air temperature) and on the level 56% (raifall) in the second decade of September. Linear regression between an aveage of temperature and sum of raifall in the second and third decade of September and reducing sugars content in potato tubers after harvest showed that an average air temperature of 12°C, reduction of air temperature in this period of 1°C and increase of rainfall of 10 mm caused the accumulation of reducing sugars of 0,6 mg·kg–1 fresh weight in potato tubers grown on light soil.