Volume 50 Number 1 Article 11
Year 1996 Month 1
Title: Performance Potential and Stability of 15 Apple Rootstocks as Affected by North American Growing Sites Over the Period 1984-1993
Authors: W.C. Olien, D.C. Ferree, and B.L. Biship
Abstract:
Stability analysis models were developed by
the method of joint linear regression for the
cumulative performance of 15 apple rootstocks
evaluated in replicated trials in 29 sites located
across North America over a period of 10 years.
Stability analysis provides a simple graphical
basis to compare rootstocks based both on
mean performance and on the stability, or consistency, of that performance across sites for a
given trait.
Models were developed for cumulative tree growth (based on trunk cross-sectionalarea),
cumulative yield per tree, and cumulative
yield efficiency (yield per trunk cross sectionalarea).
Rootstocks followed a trend varying from low mean potential with high stability across
sites, to high mean potential with low stability
across sites for all three performance variables.
However, no rootstock demonstrated a simultaneous improvement in both mean potential
and stability of tree performance in contrast to
models developed previously for the 1980-1989
NC-140 apple rootstock trial.
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