Volume 48 Number 4 Article 17 Pages: 251-256
Year 1994 Month 10
Title: Growth, Productivity, Spur Quality, Light Transmission and Net Photosynthesis of 'Golden Delicious' Apple Trees on Four Rootstocks in Three Training Systems
Authors: T.A. Baugher, Suman Singha, D.W. Leach and S.P. Walter
Citation
Abstract:
A study was conducted in 1990 to 1992 to
compare growth and efficiency of 'Golden Deli
cious' apple [Mains domestica Borkh.] trees on
four rootstocks (MM.111EMLA, M.7a, M.26-
EMLA, M.9EMLA) in three training systems (3-
wire palmette trellis, freestanding central leader,
nonpruned). No pruning compared to central
leader pruning reduced height of trees on M.9-
EMLA, M.26EMLA, and M.7a but not of trees
on MM.111EMLA. Trees on M.9EMLA were
the smallest and most yield efficient trees; those
on M.7a were the least yield efficient.
Height
and width were reduced in the 3-wire trellis
system, yet yield efficiency was equal to that of
the central leader system.
Spur quality was
higher in the 3-wire trellis and the central leader
systems than in the nonpruned system, but
tnere were no consistent differences among
rootstocks.
Light transmission was greatest in
trees in the 3-wire trellis and the central leader
systems and on M.9EMLA rootstock.
Net photo
synthesis (Pn) was greatest in trees in the 3-wire
trellis system and was lowest in trees on M.9-
EMLA rootstock.
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