Published in Scientific Papers. Series B, Horticulture, Vol. LXV, Issue 1
Written by Anelia POPOVA
The studied 'Syrah’ clones are in full fruiting and are planted in area with a transitional-continental climate. They were grafted on the Berlandieri x Riparia SO4 rootstock. A spur pruning system was used. The clones were chosen because of their widespread distribution in Bulgaria, as each of them is characterized with identity, biological and production potential, valuable economic and technological qualities. The aim of the study is to determine the supply of vine canes with nutrients and their impact on the cold resistance of winter buds. The 'Syrah’ variety has medium cold resistance, and the SO4 rootstock provides better wood maturation of the grafted vines. There is a difference of winter buds frost resistance in the vine. It depends on the variety, the tissue maturation degree and the buds dormant stage. The establishment of differences in cold resistance for some 'Syrah’ clones participating in the study will be used as a zoning criteria in places with low temperatures during the autumn-winter period and will be indicative to adapt to changing climate conditions.
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