Volume 45 Number 4 Article 4
Year 1991 Month 10
Title: Long-Term Performance Potential and Stability Across 10 Environments for Nine Apple Rootstocks Tested in the 1980-81 NC-140 Trial
Authors: W.C. Olien, D.C. Ferree, and B.L. Bishop
Abstract:
Nine apple rootstocks grafted with 'Starkspur
Supreme Delicious' were evaluated in 19 sites
over 10 years by the NC-140 Regional Project as
a randomized complete block with 10 replica
tions at each site.
Effect of site on rootstock
trunk cross-sectional-area (TCSA), cumulative
yield per tree (Yc), and cumulative yield effi
ciency (YEc = Yc/TCSA) were evaluated.
Rootstock
differences in average performance and
in stability of performance across environments
(mean and slope through the mean across sites)
were evaluated by stability analysis.
MAC.24
had highest mean Yc and TCSA with the lowest
stability, giving this rootstock the highest pre
dicted Yc and TCSA in best sites, and lowest in
poor sites.
M.27 EMLA was the opposite, with
low potential and high stability in Yc and TCSA.
M.27 EMLA and MAC.9 had high potential and
low stability in YEc, OAR 1, M.7 EMLA, and
especially MAC.24 were the opposite, and O.3
and M.26 were average in both respects for
YEc.
M.9 had high potential YEc with average
stability, while M.9 EMLA was unique in having
both high potential and high stability in YEc.
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