The climatic parameters influence on the dynamic of blooming of apple cultivars and so their productivity. The study aims to investigate the climatic factors and their influence on blooming times of apple cultivars. The measurements were carried out on 586 apple varieties in the plantation of an assortment (gene bank). The subsequent periods of development of tree named as ‘phenophases’ such as the beginning of bloom, main bloom and the end of bloom were observed in each of the varieties between 1984 and 2001. During this period the meteorological data-base keeps 7 meteorological variables for analysis. The findings revealed that the hibernal maxima were the most active factor among the meteorological variables of the former autumnal and hibernal periods which influence on the start of bloom of trees in the subsequent spring. The mean differences of daytime and night summer temperature of the last year seemed to be effective on the start of bloom.

Keywords