Effects of postharvest topping, autumn cincturing, and paclobutrazol on growth, yield, and fruit quality of the low chill nectarine cv. Sundowner in subtropical Australia

1993 ◽  
Vol 33 (3) ◽  
pp. 353 ◽  
Author(s):  
AP George ◽  
RJ Nissen ◽  
T Rassmussen
Keyword(s):  
Fruit Quality ◽  
Seasonal Pattern ◽  
Growth Yield ◽  
Tree Size ◽  
Yield Efficiency ◽  
Fruit Maturity ◽  
Canopy Volume ◽  
Effect On Yield ◽  
Subtropical Australia

Combinations of 3 methods of controlling tree size (use of the growth retardant paclobutrazol, postharvest topping, and autumn cincturing) were evaluated for their effects on growth, yield, and fruit quality of the low chill nectarine cv. Sundowner in subtropical Australia. Compared with controls over 3 seasons, paclobutrazol used alone reduced tree size by 34-52%, with further reductions when combined with light and severe postharvest topping (by 5-25 and 58-71%, respectively). Yield efficiency (as measured by yield per unit canopy volume) was significantly improved by paclobutrazol and was doubled when paclobutrazol was combined with severe postharvest topping. Although this combination reduced time associated with pruning, thinning, and harvesting, it had the disadvantage of delaying flowering and, consequently, fruit maturity in the subsequent harvest season. Light postharvest topping and autumn cincturing used with paclobutrazol had little effect on yield efficiency, fruit quality, or harvest period. The seasonal pattern of starch reserves for twigs was similar for all treatments, with starch levels falling to a minimum during the early harvest period. Measurements of starch in the major tree organs showed that at very low harvest increments (<10) there was little or no depletion of starch from the twigs and leaves, but as harvest increments increased (range 10-40), there was increasing starch depletion, in order of priority, from the roots, trunks, and limbs.

Control of tree size and vigour in custard apple (Annona spp. hybrid) cv. African Pride in subtropical Australia

2002 ◽  
Vol 42 (4) ◽  
pp. 503 ◽  
Author(s):  
R. J. Nissen ◽  
A. P. George
Keyword(s):  
Growth Yield ◽  
Fruit Weight ◽  
Tree Canopy ◽  
Tree Size ◽  
Annona Squamosa ◽  
Canopy Volume ◽  
Custard Apple ◽  
Root Restriction ◽  
Subtropical Australia

Five methods of controlling tree size, viz. growth retardant (foliar-sprayed and trunk-injected paclobutrazol), root-restriction bags, cherimoya rootstock and sugar apple (Annona squamosa) interstock, were evaluated for their effects on growth, yield and fruit quality of custard apple (Annona spp. hybrid cv. African Pride) in subtropical Australia. Compared with trees on their own roots, sugar apple interstock was highly effective in dwarfing 'African Pride' trees, reducing tree canopy volume by 72-90%. Root-restriction bags (woven fibreglass) proved to be only partially effective in controlling tree size due to growth of major roots through the seams. Compared with trees on their own roots, cherimoya rootstock alone, and sugar apple interstock increased fruit weight per unit canopy volume by a maximum of 3- and 5-fold, respectively. Sugar apple interstock reduced the severity of fruit disorders 'woodiness' and 'brown pulp' by about 75 and 50%, respectively.

scholarly journals The influence of rootstocks on the growth, yield and fruit quality of the plum cultivar Cacanska rana

2019 ◽  
Vol 64 (2) ◽  
pp. 165-174
Author(s):  
Dragan Milatovic ◽  
Mirjana Radovic ◽  
Gordan Zec ◽  
Djordje Boskov
Keyword(s):  
Fruit Quality ◽  
Growth Yield ◽  
Fruit Weight ◽  
Soluble Solids ◽  
Planting Density ◽  
Total Acid ◽  
Danube Basin ◽  
Cross Sectional ◽  
Yield Efficiency

The paper examines the influence of three clonal rootstocks ('Pixy', 'Fereley' and 'St. Julien A') along with seedlings of Myrobalan (control) on the growth, yield and fruit quality of the plum cultivar 'Cacanska Rana'. Research was conducted in the area of the Belgrade Danube basin for the six-year period (2013-2018). In comparison to control, all three clonal rootstocks have shown a significant effect on the decrease of vigor expressed as a trunk cross-sectional area. The lowest vigor was found in trees on the 'Pixy' rootstock, then on 'Fereley' and 'St. Julien A' rootstocks. Regarding the rootstocks 'Fereley' and 'St. Julien A', significantly higher fruit set and yields were achieved in comparison to control. Clonal rootstocks induced an increase in the yield per hectare ranging from 72% to 93% compared to Myrobalan. The highest yield efficiency was found in the trees on the 'Fereley' rootstock, followed by the yields observed in the trees on the 'Pixy' and 'St. Julien A' rootstocks. Significantly higher fruit weight compared to control was obtained in the trees on the 'Fereley' rootstock. Rootstocks did not show any significant effect on the soluble solids and total acid contents of the fruit. Based on the results obtained, it can be concluded that all three clonal rootstocks showed better results than Myrobalan, and can be recommended for establishing intensive plum plantations with higher planting density. The best results in terms of yield and fruit quality were obtained with the 'Fereley' rootstock.

scholarly journals Growth, Yield, Efficiency, and Fruit Quality of Five Navel Orange Clones During 4 Years

1969 ◽  
Vol 68 (4) ◽  
pp. 405-411
Author(s):  
Agripino Pérez-López ◽  
Carlos J. Torres
Keyword(s):  
Puerto Rico ◽  
Growth Yield ◽  
Tree Height ◽  
Fruit Weight ◽  
Navel Orange ◽  
Yield Efficiency ◽  
Acid Ratio ◽  
Canopy Volume ◽  
Selection Of

Clone 7 can increase three-fold the production of navel oranges in Puerto Rico. Clone 7 produced 293 fruits per tree. The number and weight of fruits per tree increased with age, whereas the size and fruit weight, navel volume and peel weight diminished. Growth measurements such as rootstock and scion diameter, scion/rootstock ratio, canopy diameter, tree height, and canopy volume are not as good parameters for the selection of navel orange clones as the number of fruits per m3 of canopy volume. Screening for varieties according to yield revealed that clones 5 and 7 were the most productive and that they should be recommended to the citrus growers. Clones 5 and 7 also had the highest Brix and acidity values, and an intermediate pH, which contribute to an appropriate Brix/acid ratio, typical of the high quality of these navel clones. The smallest fruits had significantly the highest juice percentage.

scholarly journals Growth, yield and fruit quality of 'Washington Navel' orange on four rootstocks during the first four years of production.

1969 ◽  
Vol 85 (3-4) ◽  
pp. 143-149
Author(s):  
Félix M. Román-Pérez ◽  
Agenol González-Vélez
Keyword(s):  
Puerto Rico ◽  
Fruit Quality ◽  
Citrus Sinensis ◽  
Growth Yield ◽  
Tree Canopy ◽  
Navel Orange ◽  
Washington Navel ◽  
Canopy Volume ◽  
Swingle Citrumelo

Performance of the rootstocks 'Swingle citrumelo', 'Naronja' and mandarins 'Cleopatra' and 'Sun Chu Sha' on 'Washington Navel' orange [Citrus sinensis (L.)] was evaluated at Corozal and Isabela, Puerto Rico, during the first four years of production. Mean number of fruit per tree was significantly different between locations and among rootstocks for 1996-97 and 1997- 98. Data were not taken in 1998-99 because of damage caused by Hurricane Georges. The first two years the amount of fruit was significantly higher at Corozal than at Isabela, with Swingle producing greatest fruit yield. In 1999-00 (fourth year of production) no significant differences between locations were detected for tree canopy volume. Significant differences for internal fruit quality were detected between locations and among rootstocks for acidity, brix/acidity ratio and pH. No significant differences were observed for brix between locations or among rootstocks.

scholarly journals Growth, Yield and Fruit Quality of Strawberry (Frageria ananasa Dutch) under Different Phosphorus Levels

2017 ◽  
Vol 2 (2) ◽  
pp. 19 ◽  
Author(s):  
Husain Ahmad ◽  
Muhammad Sajjid ◽  
Sikandar Hayat ◽  
Rizwan Ullah ◽  
Muhammad Ali ◽  
...  
Keyword(s):  
Fruit Quality ◽  
Fruit Set ◽  
Fruit Size ◽  
Growth Yield ◽  
Soluble Solids ◽  
Strawberry Fruit ◽  
Fruit Maturity ◽  
The University ◽  
Phosphorus Levels

<p><em>Strawberry fruit takes less time for production and is easily multiplied. Fruiting is an exhaustive process and depletes nutrients especially phosphorus as it is highly immobile in the soil. An experiment was conducted in The University of Peshawar, Pakistan to evaluate different level of Phosphorous on growth, yield and fruit quality of Strawberry Cv Chandler. Results show that Phosphorus at 90 kg ha<sup>-1</sup> significantly influenced the days to flowering (102.66) of strawberry plants while, at 80 kg ha<sup>-1</sup> significantly affected days to fruit set (2.98), days to fruit maturity (20.05), Number of fruits (7.50) and Total fruit yield tons ha<sup>-1</sup>(3.61). Fruit size (6.42 cm3) was significantly affected at 70 kg ha<sup>-1</sup>. Similarly, Ascorbic acid (62.61), percent acidity (0.64) and Total soluble solids (7.83) were significantly affected by phosphorus at 60 kg ha<sup>-1</sup></em></p>

Effect of Canopy Angle and Row Spacing on Tree Growth, Yield, Light Interception, and Fruit Quality of Y-trellis-trained Apple Trees

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 547d-547 ◽  
Author(s):  
Terence L. Robinson
Keyword(s):  
Fruit Size ◽  
Growth Yield ◽  
Free Standing ◽  
Apple Trees ◽  
Cross Sectional ◽  
Yield Efficiency ◽  
Strong Positive Relationship ◽  
Canopy Volume ◽  
The Relationship

`Empire'/M.9/MM.106 and `Ace Delicious'/MM.106 apple trees were planted in 1985 at three between row spacings (3.0 m, 4.25 m and 5.5 m) and were trained as either free standing central leaders or as Y-shaped hedgerows for 13 years. The Y hedgerow arms had varying angles from 40° to 80° above the horizontal. Final scaffold length, canopy volume, trunk cross-sectional area, and above-ground canopy weight were positively correlated to the angle of the Y arms. As the angle of the Y arms became more horizontal, the amount of growth removed during summer pruning increased. At the flattest angle (40° above horizontal), terminal growth of both cultivars ceased and excessive vertical sucker growth resulted. As the angle of the Y arms became more vertical, more terminal growth was obtained and less shoot growth had to be removed during summer pruning. Cumulative yields of the Y-shaped trees were generally greater than those of the central-leader-trained trees. Exceptions were the most horizontal and the most vertical canopy angles, which had the lowest yields. The relationship between angle of Y arms and yield showed a broad optimum between 50° and 70° above the horizontal. There was also a strong positive relationship between tree density and yield. `Empire' fruit size was smaller from the Y-shaped trees than from the central-leader trees. The optimum angles for fruit size were the intermediate angles. Fruit color was poorest on the flattest angles and best on the most-vertical angles. The best yield efficiency was at intermediate angles (50° 70°). This resulted in the best balance of vegetative growth and cropping.

Growth, yield, and fruit quality of two non-astringent persimmon (Diospyros kaki) cultivars, Izu and Fuyu, in subtropical Australia

1994 ◽  
Vol 34 (2) ◽  
pp. 267 ◽  
Author(s):  
AP George ◽  
RJ Collins ◽  
RJ Nissen
Keyword(s):  
Fruit Quality ◽  
Growth Yield ◽  
Diospyros Kaki ◽  
Variable Range ◽  
Fruit Thinning ◽  
Small Fruit ◽  
Bird Damage ◽  
Subtropical Australia

Growth, yield, and fruit quality of 2 non- astringent persimmon (Diospyros Inaki) cultivars, Izu and Fuyu, were evaluated under subtropical conditions of coastal Australia. Although maximum tree yields for Izu and Fuyu were high (24 and 37 t/ha, respectively) the percentage of fruit suitable for export was low and variable (range: Izu 8.547%; Fuyu 2844%). Main fruit quality defects were wind rub, petal adherance marks, fruitfly stings, calyx cavity, sunburn, and bird damage. Without fruit thinning, both cultivars were susceptible to overcropping in some seasons, which resulted in a high percentage (>40%) of small fruit (<150 g). Most fruit (80% for Izu and 90% Fuyu) had Brix levels higher than the recommended export standard of 14�.

scholarly journals Growth, Yield, and Fruit Quality of Eight Lemon Cultivars in Arizona

1990 ◽  
Vol 115 (1) ◽  
pp. 6-8 ◽  
Author(s):  
Esmaeil Fallahi ◽  
D. Ross Rodney ◽  
Zahra Mousavi
Keyword(s):  
Fruit Quality ◽  
Growth Yield ◽  
Sieve Tube ◽  
Tree Canopy ◽  
Soluble Solids ◽  
Citrus Limon ◽  
Yield Efficiency ◽  
Seed Content ◽  
Solids Content

Tree growth, yield, and fruit quality of eight lemon cultivars [Citrus limon (L.) Burro. f.] on macrophylla (Alemow) (C. macrophylla Wester) rootstock were compared when grown in sandy soil in the arid climate of south-western Arizona. `Foothill Lisbon' had higher cumulative yield and titratable acids than `Monroe Lisbon', `Prior Lisbon', `Eureka', and `Villafranca', and had larger fruit than other `Lisbon' cultivars. `Prior Lisbon' produced a larger tree canopy with lower yield efficiency than all other cultivars and did not show any decline due to sieve tube necrosis 12 years after planting. Overall, `Eureka' cultivars and `Villafranca' had lower relative cumulative yields, canopy volumes, total soluble solids content, titratable acids, and seed content, but higher tree decline than `Lisbon' cultivars. Overall, `Foothill Lisbon', in spite of carrying exocortis viroid, produced good yields and fruit quality and `Prior Lisbon' had a satisfactory growth-performance.

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