scholarly journals Effect of foliar‐applied gibberellins and soil‐applied paclobutrazol on reproductive and vegetative growth of ‘Braebum’ apple trees growing under a high‐density planting system

1997 ◽  
Vol 25 (1) ◽  
pp. 49-58 ◽  
Author(s):  
T. Khurshid ◽  
D. L. McNeil ◽  
M. C. T. Trought
Keyword(s):  
Vegetative Growth ◽  
High Density ◽  
Apple Trees ◽  
Planting System

scholarly journals High Density Apple Planting Systems

1974 ◽  
Vol 3 (2) ◽  
pp. 35-45
Author(s):  
Darrel Good
Keyword(s):  
Vegetative Growth ◽  
High Density ◽  
Apple Orchards ◽  
Bearing Surface ◽  
Standard Tree ◽  
Planting System

Historically, the standard tree set in commercial apple orchards has been 27 trees per acre, planted on 40 foot centers. With this planting system trees tend to become quite large, requiring substantial amounts of labor for pruning, spraying and harvesting. The large amount of vegetative growth on these trees renders much of the innertree fruit bearing surface unproductive due to shading.

scholarly journals Yield-density relations for apple trees on a dwarfing and a semi-dwarfing rootstock.

1972 ◽  
Vol 20 (1) ◽  
pp. 58-66
Author(s):  
E.W.M. Verheij ◽  
F.L.J.A.W. Verwer
Keyword(s):  
Fruit Size ◽  
Growth Control ◽  
High Density ◽  
Low Density ◽  
Apple Trees ◽  
Fruit Thinning ◽  
Golden Delicious ◽  
Tree Thinning ◽  
Tree Vigour ◽  
Planting System

In a planting system trial started in 1962 Golden Delicious trees in low-density plots at 1 100 trees/ha on M.9 and 660 trees/ha on M.2 came into bearing slowly and yields levelled off at about 40 tons/ha. In high-density plots at 3 300 and 2 260 trees/ha on M.9 and M.2, respectively, yields quickly increased to about 75 tons/ha in 1967 and 1968, but thereafter declined; this was associated with more intensive pruning and fruit thinning to restore tree vigour and fruit quality. Yield per unit of growth was initially higher but finally much lower in high-density plots, indicating that fruiting suffered more than growth from competition between trees. Yield per unit of growth was much higher on M.9 than on M.2, especially at high density. Fruit size was slightly better on M.9, and at high density the problems in maintaining fruit size were not as serious as on M.2. Growth control in the high-density M.2 plot became difficult and tree thinning may be advisable. Under the conditions of the trial the optimum density for Golden Delicious on M.9 is probably above 3 000 trees/ha and on M.2 below 2 000 trees/ha. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Effects of Rootstock, Tree Density and Training System on Early Growth, Yield and Fruit Quality of Blush Pear

HortScience ◽  
2021 ◽  
pp. 1-8
Author(s):  
Lexie McClymont ◽  
Ian Goodwin ◽  
Desmond Whitfield ◽  
Mark O’Connell ◽  
Susanna Turpin
Keyword(s):  
Fruit Quality ◽  
Vegetative Growth ◽  
Fruit Size ◽  
Growth Yield ◽  
Substantial Effect ◽  
Training System ◽  
Tree Density ◽  
High Density ◽  
Marketable Yield ◽  
And Training

Vegetative growth, orchard productivity, fruit quality and marketable yield were evaluated for rootstock (D6, BP1 and Quince A), tree density (741–4444 trees/ha), and training system (Open Tatura trellis, two-dimensional vertical and three-dimensional traditional) effects on young trees of the blush pear cultivar ‘ANP-0131’. ‘ANP-0131’ is a vigorous scion and vegetative growth, precocity, and yield were influenced by the selected rootstocks. Tree density and training system treatments exerted a substantial effect on canopy radiation interception while increasing tree density improved yield. Increasing tree density from 2222 (high density) to 4444 (ultra-high density) trees/ha did not improve cumulative yield. Crop load affected fruit size, such that “marketable” yield (yield of fruit weighing between 150 and 260 g) was greatest for trees on D6 rootstock and trained to Open Tatura trellis at high and ultra-high densities.

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