Volume 49 Number 4 Article 34
Year 1995 Month 10
Title: Growth and Performance of Four Apple Cultivars on M.26 and Mark Rootstocks With or Without Preplant Mineral Nutrients
Author: J.R. Schupp
Abstract:
To evaluate the interactions between cultivar
and rootstock, four apple (Malus domestica,
Borkh.) cultivars, 'Pioneer Mac,' 'Marshall McIntosh,' 'Ginger Gold' and 'Empire' on two rootstocks,
M.26 and Mark, were planted in a splitplot
design.
After five years, 'Pioneer Mac' and
'Ginger Gold' had larger trunk cross-sectional
area (TCSA) on M.26 than on Mark. 'Marshall
Mclntosh' and 'Empire' had larger TCSA on
Mark than on M.26. Precocity, expressed as
both number of flower clusters and yield was
greater for trees on Mark for all cultivars except
for 'Ginger Gold,' which had greater flower
cluster numbers and yield on M.26. Fruit size
was variable from year to year, depending on
crop load, however 'Pioneer Mac' and 'Ginger
Gold' usually produced the largest fruit, while
'Empire' consistently produced the smallest
fruit, 'Ginger Gold' appears to be incompatible
with Mark.
The results of this study demonstrate
that cultivar × rootstock interactions can be
significant and need to be considered when
rootstock and planting density recommendations are made.
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