The dormant period of the apple tree and its change under the influence of destabilization of weather conditions

The article presents an analysis of the features weather conditions in 2020 Central Black Earth Region. It determines main deviations from average long-term values air temperature and humidity, as well distribution precipitation. shows influence climate change recent decades, which is destabilization water-temperature regime, on passage phenophases development fruit plants, including dormant period. studies various methods determining dynamic reaction photo-system apple-tree plants varieties Lobo, Zhigulevskoe, Melba, Antonovka, Hani Crisp, Ligol stock 62-396 deep rest by non-invasive based photosynthetic activity intensity photosynthesis chlorophyll-containing tissues. prospects registration tissues annual branches for monitoring period dormancy. was found that real parameters changes index during transition to dormancy possible only field. Cut placed favorable laboratory conditions, show smoothed fluctuations level fluorescence chlorophyll-a assimilation tissues, depending functional state plant organism.