Abstract
The article presents the data of phenological observations for the period of 2011-2013 for northern oak (Quercus borealis) and English oak (Quercus robur) in the training and experimental forestry of BSETA (Bryansk region). An attempt was made to identify the relationship between the amount of effective tem-peratures, the amount of rain and the onset of different phenological phases in northern oak and in Eng-lish oak. The close relationship (r = 0,794) was revealed between the length of the growing season in northern oak and the sum of effective temperatures of air above + 5ºC. Introduced oak, as well as local one, has complete cycle of seasonal development of vegetative and generative organs.
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