Long-Term Performance Potential and Stability Across 10 Environments for Nine Apple Rootstocks Tested in the 1980-81 NC-140 Trial
DOI:
https://doi.org/10.71318/apom.1991.45.4.208Abstract
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 replications at each site. Effect of site on rootstock trunk cross-sectional-area (TCSA), cumulative yield per tree (Yc), and cumulative yield efficiency (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 predicted 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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