Volume 50 Number 1 Article 2
Year 1996 Month 1
Title: Performance of the NC-140 Cooperative Apple Rootstock Planting: I. Survival, Tree Size, Yield and Fruit Size
Author: NC-140 Committee
Abstract:
In 1984, trees of 'Starkspur Supreme Delicious'
apple (Malus × domestica Borkh) on 15 rootstocks
were planted at 31 sites in North America
according to guidelines established for cooperative testing by the North Central Regional Cooperative Project (NC-140). Tree loss was greatest on P.22 (32%) and MAC.39 (21%). Trees on
P.18, A.313, B.490, MAC.l and M.4 had trunk
cross-sectional areas (TCA) and yield efficiencies similar to seedling (SDL). P.l produced
trees similar in size, production and yield efficiency to M.7EMLA. C6 and M.26EMLA resulted in trees of similar size, yield and yield
efficiency MAC.39 and B.9 had similar TCA's,
yield ana yield efficiency, but trees on B.9 were
shorter with smaller spread.
Fruit size over 6
years from trees on P.22, M.4 and SDL was
small, while fruit size tended to be large from
trees on P.18, A.313 and C6.
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