Volume 47 Number 3 Article 10 Pages: 172-178
Year 1993 Month 7
Title: Influence of Fruit Spacing on Fruit Quality and Mineral Partitioning of 'Redchief Delicious' Apple Under Full Crop Conditions
Authors: E. Fallahi and B.R. Slmons
Citation
Abstract:
Yield, fruit quality, and mineral partitioning
in fruit and leaf tissues of 'Redchief Delicious'
apple (Malus domestica Borkh.) on M.9/MM.106
and M.9/MM.111 with five levels of fruit spac
ing (thinning) at harvest and after six months of
storage were studied under full crop conditions.
Fruit weight in the trees thinned at 18 cm
spacing was higher, but yield was lower than
those of both 5 and 10 cm spacings.
Trees
thinned at 36 cm spacing had a higher return
bloom and yield in the following year.
Fruit
spacing greater thanlO cm increased fruit color
and soluble solids concentration (SSC) both at
harvest and after storage.
Fruit firmness at
harvest was not affected by fruit spacing, but
fruit from 18 and 25 cm spacings had signifi
cantly lower firmness than all other spacings
after storage.
Fruit spacing greater than 10 cm
decreased N but increased K expressed at mg
K/lOOg fresh weight in both leaf and fruit
tissues.
Trees thinned at 5 and 10 cm spacings
had similar levels of fruit Ca, and both had
significantly higher fruit Ca than those thinned
at 18, 25 and 36 cm spacings.
All quality and
mineral composition factors considered, thin
ning fruit to a 10 to 18 cm spacing is beneficial,
depending an the market demands and objec
tives of production.
Thinning at distances
greater than 18 cm between fruit is not advis
able, as yield was drastically reduced without
gaining additional fruit color or firmness. 'Redchief
Delicious' trees on M.9/MM.106 had a
higher yield, but lighter fruit color and lower
SSC than those on M.9/MM.111, although fruit
on both interstock/rootstock combinations had
similar weights.
Fruit from trees on M.9/MM.106
had higher Cu, Mn and Mg than those on
M.9/MM.111.
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