Induction of Proleptic Shoot Formation on Pome Fruit Nursery Trees

Ki, Theron; Wj, Steyn; Jacobs, G.

doi:10.17660/actahortic.2000.514.27

Cited by 10 publications

(2 citation statements)

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“…The goal of modern high-density orchard systems is to achieve high yield at early tree age (Cody et al, 1985;Jaumien et al, 1993;Theron et al, 2000).…”

Section: Badiu Et Almentioning

confidence: 99%

The Influence of cultivar, rootstock and culture system on growth and yield in apple

et al. 2015

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The influence of two apple rootstocks (M9 and MM106) on growth and yielding of four apple cultivars ("Pinova"‚ "Topaz", "Florina" and "Golden Reinders") in two culture system was studied. The experiment was placed in a commercial orchard at SC Agroindustriala Cluj-Napoca Romania, planted in 2007, during 2012-2104. In the experimental field some growth parameters (length of annual shoots, trunk cross-sectional area, tree height) and fructification (average yield and productivity index) were observed. The studied cultivars had a different response due to the genetic characteristic of each one and on the other hand, due to the rootstock. The results showed that MM 106 transmit much strongly growth than M9. The longest shoots, in terms of mean values, gave the variants where the cultivars were grafted on MM106 (53 cm) and the shortest (34.4 cm) on M9. The biggest average height of trees were obtained on MM 106 rootstock (290 cm). The smallest average trees height were registered by the variants where the trees were grafted on M9 (239 cm). The biggest average trunk cross sectional area were obtained with the MM106 (102.1 cm2). The best yield was obtained in variant where the cultivars were grafted on M9 (47.03 t/ha). M9 rootstock has controlled the tree size of all cultivars more than MM106 resulting in the lowest TCSA (58.8 cm 2 ) and the highest yield per hectar (47.03 tone/ha) and yield efficiency (925 kg/cm 2 ).

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“…The goal of modern high-density orchard systems is to achieve high yield at early tree age (Cody et al, 1985;Jaumien et al, 1993;Theron et al, 2000).…”

Section: Badiu Et Almentioning

confidence: 99%

The Influence of cultivar, rootstock and culture system on growth and yield in apple

et al. 2015

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“…That is why fruit growers look for nursery trees with a strong leader and an extensive crown with many lateral shoots. The use of strong, well-branched nursery trees is a prerequisite for early and high yields (Theron et al 2000). Since fruits develop from flowers, the yield-forming potential of trees, regardless of their size in a given year, depends primarily on the number of flower buds developed in the spring.…”

Section: Introductionmentioning

confidence: 99%

Application of ImageJ Software in the assessment of flowering Intensity and growth Vigor of Pear Trees

Treder

Klamkowski

Tryngiel-Gac

et al. 2021

Journal of Horticultural Research

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The study evaluated the possibility of using the image acquisition and processing method with ImageJ software for estimating growth vigor and flowering intensity of ‘Conference’ pear trees. For assessing flowering intensity, manual counting of flower clusters and taking of photographs of the trees were conducted at full bloom. Tree vigor was estimated by manually measuring the total length of the central leader and shoots of individual trees. The trees were photographed from the same distance using a hand-held camera. The calibration model for assessing the vigor or flowering of trees by image analysis was based on measurements and photographs taken for nine selected trees differing in the total length of shoots or in the number of flower clusters. Then, a quality assessment of the model was carried out on 26 nonselected trees. Image processing was performed using ImageJ software. High regression coefficients were obtained between the surface area of petals measured on the photographs and the number of inflorescences counted (r2 = 0.98); however, observations carried out in the following year indicate the need for individual calibration of estimation models in each evaluation season. Subsequently, the quality of estimating the flowering intensity of pear trees was assessed using a previously determined calibration model. Mean absolute percentage error (MAPE) values ranged from 14.0% to 21.8%, depending on the measurement time. In the assessment of tree growth vigor, a high correlation (r2 = 0.98) was also obtained between the actual length of shoots measured individually for each tree and the values obtained by analyzing the photographic image, where the MAPE error was 12.9%.

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