BEHAVIOUR OF SOME APPLE VARIETIES, GRAFTED ON VEGETATIVE ROOTSTOCK IN THE ORCHARDS OF SOUTHERN ROMANIA
The increase of fruit production per hectare and the improvement of its quality can be achieved by the correct selection of the two partners x rootstocks, in accordance with the vegetative factors in the area.Â In order to choose and promote the most valuable rootstocks in the culture, it is necessary to differentiate the best rootstocks for each area of culture and variety, taking into account that rootstocks influence the entry of trees into bearing fruit stage, the vigor, the quantity and the quality of production.
The study aimed at evaluating the behaviour of Florina and Red delicious varieties grafted on MM 104, MM 106 and MM 109 rootstocks in the specific pedoclimatic conditions in the south of Romania between 2016 and 2018 period.Â The MM 109 rootstock determines the higest increase in thickness during the first eight years after planting. The Red delicious variety grafted on MM104 and MM106 achieves a ratio between cuttings and rootstocks closer to 1 (per unit), compared to grafting on MM 109 rootstock. The root system of grafted trees on MM 109 shows a much greater development compared to the other two rootstocks, ensuring the trees a better anchorage in the soil. The higest number of active roots for the studied rootstocks within a radius of 1 m from the trunk, is at a depth of 20-40 cm, and the number of roots decreases with the depth. High quality fruits with a higher weight and size index were obtained on MM 104 and MM 106 rootstocks.Â Â