ISHS Acta Horticulturae 557: VII International Symposium on Orchard and Plantation Systems
ROOTSTOCK AND SCION INTERACT TO AFFECT APPLE TREE PERFORMANCE: RESULTS FROM THE 1990 NC-140 CULTIVAR/ROOTSTOCK TRIAL |
| Author: | W.R Atio |
| Keywords: | trunk cross-sectional area, yield, yield efficiency, fruit size, tree survival |
| Abstract:
In 1990, trials were established at 13 sites in the United States including four apple cultivars (Smoothee Golden Delicious, Nicobel Jonagold, Empire, and Law Rome) in all combinations on five rootstocks (M.9 EMLA, B.9, Mark, O.3, and M.26 EMLA). After nine growing seasons, rootstock and scion cultivar interacted significantly to affect trunk cross-sectional area and yield efficiency but not yield per tree, fruit size, or tree survival. For Golden Delicious and Empire, trees on M.26 EMLA were largest, followed by those on O.3, M.9 EMLA, B.9, and Mark. Jonagold trees on M.9 EMLA were larger than those on O.3; whereas, Rome trees on these two rootstocks were similar in size. M.26 EMLA resulted in the greatest yield per tree, followed by O.3, M.9 EMLA, B.9, and Mark. For Golden Delicious and Jonagold, trees on M.26 EMLA were less yield efficient than trees on the other rootstocks, and those on Mark and those on B.9 were more efficient than trees on M.9 EMLA or O.3. For Empire, trees on Mark were the most yield efficient, those on M.26 EMLA were the least, and trees on B.9 and those on M.9 EMLA were more yield efficient than trees on O.3. For Rome, trees on B.9 were the most yield efficient, those on M.26 EMLA were the least, and trees on B.9, Mark, and O.3 were similar. M.26 EMLA and M.9 EMLA resulted in the largest fruit in the ninth season, and Mark and O.3 resulted in the smallest. Fruit from trees on B.9 were intermediate between the two groups. B.9 resulted in the best tree survival followed by M.26 EMLA, Mark, M.9 EMLA, and O.3. | |
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