Performance of 'Golden Delicious' and 'Delicious' apples on dwarfing rootstocks.

摘要

Planting of 'Golden Delicious' (GD) and a spur type Delicious (RD) apple plants was established in 1984 to evaluate their performance on P.2, P.22, B.146, B.491, M.9, Lancep, Cepiland, CG.10, and CG.24 rootstocks. In addition to those rootstocks RDwas also propagated on M.20 and M.26. At the end of the twelfth growing season, RD trees had a smaller trunk cross sectional area than GD on the same rootstock. Trees on P.22 for both cultivars had not filled their allocated space by 1995 and consistently had the lowest per tree yields. Trees on CG.24 were the largest trees in the planting as measured by TCA. GD and RD on Lancep, Cepiland, and CG.10 were relatively similar in size to the same cultivar on M.9. The combination of GD/P.2 was significantlylarger than GD/M.9, but RD/P.2 was smaller than RD/M.9. GD on Cepiland and RD on M.26 had the highest cumulative yield at the end of 12 seasons. Yields in individual years were paired for analysis due to biennial bearing tendencies. In individual pairedyears, GD on Cepiland had the highest yield in 3 out of 4 periods. Tree efficiency was lesser on the more vigorous rootstocks. Overall, Lancep and Cepiland tended to induce a greater increase in yield in RD than in GD compared to yields on M.9.