Volume 45 Number 4 Article 10
Year 1991 Month 10
Title: Effects of Rootstock on Productivity and Pruning Requirements of 'Starkspur Supreme Delicious' Apple Trees in the NC-140 Cooperative Planting
Authors: D.C. Elfving and E.D. McKibbon
Abstract:
Estimated early yields per ha. (1982-1985) of
'Starkspur Supreme Delicious' apple trees plant
ed on nine rootstock clones in 1980 were directly
related to estimated planting-system density
except for trees on M.27 EMLA. In contrast,
estimated yields per ha. from 1986 through 1989
for all rootstocks were not influenced by esti
mated planting-system density.
Dormant-prun
ing time requirements from 1982 through 1989
were most influenced by the need for a ladder
during pruning.
Where ladder use was unneces
sary, dormant-pruning time was inversely pro
portional to tree size, but to a much lesser
extent than for trees requiring a ladder.
Pruning
costs represented a small fraction of estimated
crop value.
Although cumulative estimated pro
duction per ha. did not differ significantly
among rootstocks, there was a significant, posi
tive relationship between estimated net crop
value (crop value minus pruning costs) and
estimated planting density.
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