Effect of split root systems and water content on growth, physiological traits and nutrient status of “Golabe-Kohanz” apple trees grafted on M9

Water scarcity is the most important factor limiting the production of horticultural products, especially in semi-arid countries such as Iran. Application of appropriate methods to increase growth and nutritional status of fruit trees is the most important factor for optimal fruit production. This study was carried out as a factorial randomized complete block design with three replications on Golabe-Kohanz apple cultivar grafted on M9 rootstock. Treatments consisted of tree bag placements (no bag, one bag and two bag) and irrigation (50, 75 and 100% of field capacity). Physiological, reproductive and nutritional characteristics of the trees were evaluated 24 months after planting. Results showed that the interaction effects of different levels of irrigation were significant on leaf fresh weight, leaf area, plant height, total chlorophyll and leaf nitrogen content (p≤%5) and the effects were significant on plant height, trunk diameter, leaf potassium, leaf number and flowers (at p≤%.). Plant height, trunk diameter, and leaf potassium increased significantly with 75% irrigation and two bags. In 75% irrigation and one bag Leaf nitrogen was 52.91% more than that of 75% irrigation without bag. Therefore, this system is recommended for cultivation of dwarf apples cultivars.