THE INFLUENCE OF ROOTSTOCK ON THE PHENOLOGICAL ASPECT FOR SOME APPLE TREE VARIETIES
The behaviour of apple tree varieties in various regions is different both because of the climate and soil conditions and because
of the affinity between the two partners variety-rootstock.
The varieties should have high production qualities, very good compatibilities with rootstocks on certain soils, high resistance to particular diseases and pests. The presence of annual branches within the tree crown is important since it provides the fruit continuity, respectively the production continuity. The Tenroy variety was characterised by fewer annual branches, therefore the tree vigour was smaller. The annual branches should be 30-60 cm long; better percentages were registered for Generos (26,0%), Florina (22,2%) and Romus 1 (21,6%).
There is a correlation between the number of shoots and their length during the tree growing process. For Romus 1 and Florina varieties, the shoot length was smaller, but the shoot number was higher. We noticed a higher percentage of fruit formation for Jonagold 60 %, then for Tenroy 41 % and Romus 1- 40 %. We noticed the highest percentage of developed fruit out of the total open flowers at early ripening varieties.
The fruit development lasted between 65 and 90 days. We noticed a shorter time of fruit development for the Romus 1 variety (65 days) and a longer time for the Tenroy variety (90 days). The fruit development within the analysed varieties presents an ascendency, then a development maximum, and finally a slowdown followed by the end of the development.
In the southern area, in order to provide large fruit supplies, we may keep in range the following varieties: Romus 1, Florina, Jonagold and Generos.
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