N. Keranova, F. Ermolova, V. Roytchev, Z. Nakov, A. Ivanov
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EFFECT OF HIGH-STEM FORMATIONS ON FERTILITY, YIELD AND QUALITY OF GRAPES OF BOLGAR VARIETY
The effect of different high-stem formations and winter bud load during pruning on the fertility, yield and quality of grapes of the Bolgar variety was studied. It was found that the formations, the fruiting unit type and winter bud load had a significant effect on the studied indicators of actual fertility, mass and structure of the cluster, mass per 100 grains, sugar content, titratable acids and yield. With comparatively higher values of most of these indicators, had the variants V4 – Geneva double curtain with planting distances of 4.0×1.0 m and pruning loads of 4 plugs of 2 winter buds and 1 fruit rod of 8 winter buds and V3 – Single curtain with planting distances of 3.2×1.2 m and pruning loads of 6 plugs of 2 winter buds and 2 fruit rods of 9 winter buds.
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