Duration of the growing period of domestic apple tree (Malus domestica Borkh) in the Krutovsky Botanical garden

The duration of the growing season (from bud swelling to the end of leaf fall) was analyzed in 39 varieties of Malus domestica trees grown in a creeping form on the territory of the V. M. Krutovsky orchard. The Botanical Garden is a structural subdivision of the Reshetnev Siberian State University of Science and Technology in Krasnoyarsk. The research revealed that the earliest start of vegetation for the period from 2004 to 2020 occurred in 2014. In other years, the swelling phase of the kidneys is recorded in the last decade of April or the first decade of May. The beginning of the growing season later than May 10 was noted in 2006, 2010 and 2018. The end of leaf falls in most cases ended before October 17 during the period from 2004 to 2020, in some years (2004, 2007 and 2017) - before October 23-24. Au-tumn frosts prevented the completion of the growing season in 2006 and 2016, during which the leaves froze on the trees, which was noted in most varieties. The Aurora variety (selection by Vs. M. Krutovsky) has a short growing season under these conditions; A growing season of more than 160 days was observed in nine varieties.