ESTIMATION OF CITRUS FRUIT YIELD USING ULTRASONICALLY-SENSED TREE SIZE

2006 ◽  
Vol 22 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Q. U. Zaman ◽  
A. W. Schumann ◽  
H. K. Hostler
Keyword(s):  
Citrus Fruit ◽  
Fruit Yield ◽  
Tree Size

Citrus fruit yield response to nitrogen and potassium fertilization depends on nutrient-water management system

2019 ◽  
Vol 249 ◽  
pp. 329-333 ◽  
Author(s):  
José A. Quaggio ◽  
Thais R. Souza ◽  
Fernando C.B. Zambrosi ◽  
Dirceu Mattos ◽  
Rodrigo M. Boaretto ◽  
...  
Keyword(s):  
Water Management ◽  
Management System ◽  
Citrus Fruit ◽  
Fruit Yield ◽  
Yield Response ◽  
Water Management System ◽  
Potassium Fertilization

Effect of four different canopy shapes on apple yields

1996 ◽  
Vol 36 (4) ◽  
pp. 489 ◽  
Author(s):  
JE Campbell ◽  
HI Nicol ◽  
BR Cullis
Keyword(s):  
Malus Domestica ◽  
Fruit Yield ◽  
Early Years ◽  
Tree Size ◽  
Malus Domestica Borkh ◽  
Training Systems ◽  
Individual Training

The cultivars, Jonathan, Delicious and Granny Smith apple (Malus domestica Borkh.) trees on MM.106, Northern Spy, Seedling and MM.102 rootstocks were trained as-vase, central leader, palmette and Hawkes Bay multi-leade; systems for 18 years. Rootstock significantly affected tree size, and there were interactions of rootstock with training systems or cultivars. There was also an interaction between training ' systems and cultivars. In the early years, while the training systems were being established, fruit yield was inversely related to the severity of the pruning; central leader- and palmette-trained trees had higher yields and tree efficiency than Hawkes Bay trees whose yields and tree efficiency were higher than vase trees. When yields reached maximum and the training systems became well established (after about 8 years of cropping), the total annual yield and tree efficiency per tree of individual training systems within a cultivar and rootstock differed only slightly. Cumulative yields of central leader, palmette and Hawkes Bay were higher than vase in the early years of all training systems and cultivars, while tree size was often smaller. In the latter years, cumulative yields of the central leader, palmette and Hawkes Bay systems remained slightly higher than vase, except with the less vigorous Jonathan and Granny Smith/ MM.102 combinations where yields were similar.

scholarly journals Orchard Variation in Micropropagated Trees of `Redspur Delicious' Apple

HortScience ◽  
1997 ◽  
Vol 32 (5) ◽  
pp. 935-936 ◽  
Author(s):  
Richard H. Zimmerman
Keyword(s):  
Shoot Growth ◽  
Potential Problem ◽  
Growth Habit ◽  
Fruit Yield ◽  
Tree Size ◽  
Clonal Variation ◽  
First Year ◽  
Clonal Fidelity

Micropropagated trees of `Redspur Delicious' apple (Malus ×domestica Borkh.), planted as small, actively growing trees in May 1982, lacked uniformity in tree size, appearance, and flowering by the spring of 1986. Only four of the 18 trees had a typical spur-type growth habit; these four trees had 80% more spurs per meter of shoot, 8 to 10 times as many flowers the first year of flowering and 9.5-fold higher early fruit yields, but were 40% smaller after 14 years in the orchard and had 25% less cumulative fruit yield than the nonspur types. Shoots from the spur-type trees were recultured in 1988 and the resulting trees planted in an orchard in 1990. These latter trees were uniform in appearance and all had typical spur-type growth, with about 30% more spurs per meter of shoot growth than the spur-type trees from which they were propagated. Micropropagating spur-type apples from previously micropropagated trees that have maintained clonal fidelity may overcome the potential problem of clonal variation in orchard planted micropropagated trees.

scholarly journals Initial performance of ‘Gem’ avocado trees in the Central-Western region of São Paulo State

2021 ◽  
Vol 42 (6) ◽  
pp. 3123-3134
Author(s):  
Lígia Broglio Micheletti ◽  
◽  
Tatiana Cantuarias Avilés ◽  
Edypol Guilherme Baptista ◽  
Mariana Freire Alberti ◽  
...  
Keyword(s):  
Shoot Growth ◽  
Growth Habit ◽  
Sao Paulo ◽  
Fruit Yield ◽  
Tree Size ◽  
Western Region ◽  
São Paulo ◽  
Paulo State ◽  
Late Maturity ◽  
Yield Quality

The introduction of new avocado cultivars into producing countries of the Southern Hemisphere may extend the offer period of fresh fruit for export. The ‘Gem’ (‘3-29-5’) avocado is known for extending the marketing period of ‘Hass’-like avocados. This study aimed to evaluate the horticultural performance of ‘Gem’ avocado trees between the 4th and 6th years after planting (2016-2018), in a commercial orchard in the Central-Western region of the State of São Paulo, Brazil. ‘Gem’ avocado trees grafted onto seedling rootstocks were evaluated regarding tree size, shoot growth, flowering, and fruit yield, quality and maturation. In the evaluated biennium, the trees showed a strong upright growth habit and compact tree size. Flowering occurred mainly in indeterminate inflorescences. Fruit yield varied between 106.89 to 116.89 kg tree-1, and 75-91% of the fruit classified within size counts 12 (306 to 365 g/fruit) to 18 (211 to 235 g/fruit), and reached physiological maturity in late June, but could be picked until October, i.e, four to eight months later than ‘Hass’. ‘Gem’ is a new alternative for extending fruit offer of late-maturity avocado cultivars and allowing higher profit to the farmers.

FOLIAR MICRONUTRIENT APPLICATION EFFECTS ON CITRUS FRUIT YIELD, SOIL AND LEAF ZN CONCENTRATIONS AND 65ZN MOBILIZATION WITHIN THE PLANT

2002 ◽  
pp. 203-209 ◽  
Author(s):  
A.E. Boaretto ◽  
R.M. Boaretto ◽  
T. Muraoka ◽  
V.F. Nascimento Filho ◽  
C.S. Tiritan ◽  
...  
Keyword(s):  
Citrus Fruit ◽  
Fruit Yield

scholarly journals Mechanical Thinning of Mandarins with a Branch Shaker

2020 ◽  
Vol 30 (6) ◽  
pp. 745-750
Author(s):  
Coral Ortiz ◽  
Antonio Torregrosa ◽  
Enrique Ortí ◽  
Sebastià Balasch
Keyword(s):  
Research Study ◽  
Fruit Size ◽  
Citrus Fruit ◽  
Fruit Yield ◽  
Citrus Reticulata ◽  
Labor Costs ◽  
Thinning Operation ◽  
Thinning Operations ◽  
Mechanical Thinning ◽  
Increase Efficiency

Thinning is the process of removing some flowers or fruit to increase fruit size at harvest. In the Valencia region of Spain, the thinning operation for citrus fruit (Citreae) is performed for some mandarin varieties. This is always performed manually; however, this method is very expensive. The goal of this research study was to assess the mechanical thinning of mandarin (Citrus reticulata) using a hand-held branch shaker. Different thinning treatments were conducted over a 3-year period. The gasoline-powered branch shaker was capable of detaching fruit four- to five-times faster than manual thinning. Final fruit size was significantly higher using manual and mechanical thinning compared with a no thinning treatment. Similar final fruit size was obtained with manual and mechanical thinning. However, no significant differences were found in final fruit yield by weight among no thinning, mechanical thinning, and manual thinning treatments. The use of a branch shaker could be recommended for thinning operations to increase efficiency, reduce labor costs, and obtain larger and higher-quality fruit.

scholarly journals Less Is More: A Hard Way to Get Potential Dwarfing Hybrid Rootstocks for Valencia Sweet Orange

Agriculture ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 354
Author(s):  
Danilo Pereira Costa ◽  
Eduardo Sanches Stuchi ◽  
Eduardo Augusto Girardi ◽  
Alécio Souza Moreira ◽  
Abelmon da Silva Gesteira ◽  
...  
Keyword(s):  
Production Efficiency ◽  
Sweet Orange ◽  
Fruit Yield ◽  
Tree Size ◽  
Soluble Solids ◽  
Planting Density ◽  
Rangpur Lime ◽  
Less Is More ◽  
Canopy Volume ◽  
Dwarfing Rootstocks

As in several fruit crops, citrus trees with decreased size allow for a higher planting density, which may lead to higher productivity and facilitate operations such as harvesting and spraying. The use of dwarfing rootstocks is one of the most feasible methods for tree size control, but few commercial varieties are available to date. In this work, the long-term performance of Valencia sweet orange grafted onto 51 hybrid citrus rootstocks was evaluated in rainfed cultivation at 6.0 m × 2.5 m tree spacing in Northern São Paulo State, Brazil. About a third of the evaluated hybrids were classified as dwarfing and semi-dwarfing rootstocks, that is, respectively inducing a relative canopy volume of <40% and 40–60% compared withthe standard rootstock, the Rangpur limeSanta Cruz selection. The production efficiency and soluble solids concentration were conversely related to the canopy volume. Three citrandarins of Sunki mandarin (TSKC) × Flying Dragon trifoliate orange (TRFD) were grouped within the most productive dwarfing rootstocks. Other hybrids that expressively decreased tree size were mainly sensitive to drought; therefore, the mean fruit yield was low, indicating the need for irrigation, albeit fruit quality was high. Estimated productivity on the selected TSKC × TRFD rootstocks would double to an average of 40 t·ha−1·year−1 if tree spacing wasadjusted to the smaller tree size. Although the HTR-208 citrandarin and the LCR × CTSW-009 citrumelimonia were as vigorous as the Santa Cruz Rangpur lime, they induced an outstanding fruit yield due to their highertolerance to drought and, hence, can be considered for rainfed cultivation at wider tree spacing.

Variation of Loranthaceae impact onVitellaria paradoxaC. F. Gaertn. fruit yield in contrasting habitats and implications for its conservation

Fruits ◽  
2013 ◽  
Vol 68 (2) ◽  
pp. 109-120 ◽  
Author(s):  
Thierry D. Houehanou ◽  
Valentin Kindomihou ◽  
Tariq Stevart ◽  
Brice Tente ◽  
Marcel Houinato ◽  
...  
Keyword(s):  
Fruit Yield ◽  
Contrasting Habitats

The diazepam-like sedative effects of vaporized essential oil from the Okinawan Kabuchii citrus fruit

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
Y Kobayashi ◽  
H Takemoto ◽  
Z Fu ◽  
E Shimizu ◽  
Y Kinjo
Keyword(s):  
Essential Oil ◽  
Citrus Fruit ◽  
Sedative Effects
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