Chemical Thinning of Kinnow Mandarin

Brar, S. S.; Minhas, P. P. S.; Kaundal, G.S.

doi:10.17660/actahortic.1992.321.47

Cited by 5 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Segundo Kojima et al (1986) (Marodin, 1987), 'Kinnow' (Farmaham, 1992;Brar et al, 1992), 'Mexerica do Rio' (Castro et al, 1998), 'Ponkan' (Pacheco, 1999) e em tangor 'Murcote' (Vieira, 1985;Chapman, 1984 (Vanniere & Arcuset, 1989;Agustí et al, 1992Agustí et al, , 1994aAgustí et al, , 1994bEl-Otmani et al, 1993). Resultados semelhantes foram observado por Aznar et al (1995b) com aplicações de fenotiol 20 mg.L -1 em tangerina 'Fortune', e por Agustí et al (1994a) (Weiland & Gómez, 1995).…”

Section: Resultsunclassified

Fixação e desenvolvimento dos frutos do tangor 'Murcote' (Citrus reticulata Blanco x Citrus sinensis L. Osbeck) e da lima ácida 'Tahiti' (Citrus latifolia Tanaka) com a utilização de biorreguladores.

Serciloto¹

View full text Add to dashboard Cite

Section: Resultsunclassified

Fixação e desenvolvimento dos frutos do tangor 'Murcote' (Citrus reticulata Blanco x Citrus sinensis L. Osbeck) e da lima ácida 'Tahiti' (Citrus latifolia Tanaka) com a utilização de biorreguladores.

Serciloto¹

View full text Add to dashboard Cite

“…Farmahan (1992), utilizando tangerineira 'Kinnow' (C. nobilis x C. deliciosa), obteve diferenças bastante significativas no desbaste com a aplicação de ANA e ethephon, aos 31 dias após o florescimento, onde o ethephon promoveu abscisão de frutos da ordem de 60%, e o ANA na ordem de 27%, entretanto o ethephon promoveu queda de folhas da ordem de 5%. Além desta diferença, o ANA mostrou-se menos efetivo na regulação de alternância de produção, concordando com Brar et al (1992) e Ragone (1994), que também observaram diferenças siginificativas entre a aplicação de ANA e ethephon em tangerineira 'Kinnow'.…”

Section: Resultsunclassified

Reguladores vegetais e o desbaste químico de frutos de tangor murcote

Domingues

Ono

Rodrigues

2001

Sci. agric. (Piracicaba, Braz.)

View full text Add to dashboard Cite

RESUMO: O tangor 'Murcote' apresenta necessidade de desbaste de frutos devido a alternância de produção, caracterizado por anos de excessiva produção intercalado com anos de baixa produção, evitando assim, a diminuição da qualidade dos frutos. O presente trabalho teve por objetivo avaliar a eficiência de reguladores vegetais, a auxina ANA (ácido naftalenacético) e ethephon (etileno) no desbaste químico de frutos de tangor 'Murcote' aplicado 40 dias após o pleno florescimento. O experimento foi conduzido em Pratânia, SP, onde plantas de 5 anos de idade, enxertadas sobre o limoeiro 'Cravo', foram pulverizadas com ANA a 0, 100, 200, 300 e 400 mg L -1 e com ethephon a 200, 300 e 400 mg L -1 , ambos em solução aquosa juntamente com adjuvante não iônico a 0,05%. A contagem dos frutos foi realizada previamente aos tratamentos em 2 ramos marcados por planta. O ANA não interferiu significativamente no desbaste de frutos, com porcentagens de queda variando entre 7 a 14%, enquanto que as pulverizações com ethephon mostraram maior eficiência no desbaste de frutos, principalmente na dose de 400 mg L -1 , promovendo 66,6% de queda de frutos, sem contudo induzir a abscisão foliar. As doses inferiores de ethephon também promoveram desbaste de frutos da ordem de 40%. As porcentagens de queda de frutos foram pequenas, para plantas pulverizadas com ANA, enquanto que a aplicação de ethephon promoveu maior eficiência no desbaste de frutos. Palavras-chave: Citrus reticulata, raleio, ethephon, ácido naftaleno acético PLANT GROWTH REGULATORS AND 'HONEY' ORANGE FRUIT CHEMICAL THINNINGABSTRACT: Alternate bearing is an important caracteristic of some mandarins that reduces fruit quality and yield in tangor Murcott, and to reduce this effect is necessary to perform fruit thinning to avoid high and low production year by year. To evaluate the effects of plant growth regulators on fruit thinning of the 'honey' orange, an auxin (NAA-naphthalene acetic acid) and ethephon (ethylene), were applied 40 days after full bloom in an experiment carried out at Pratania, S.P., Brazil. Five-year-old plants grafted on Rangpur lime were used, sprayed with NAA (0, 100, 200, 300 e 400 mg L -1 and ethephon (200, 300, 400 mg L -1 ), both in water solution, containing 0.05% of non ionic wetting agent. Fruit number was determined before treatment applications in two shoots per plant. NAA did not promote significant differences on fruit thinning (between 7 to 14 %), however, the application of ethephon, at all rates, increased fruit thinning by 41.6 to 66.6%, with concentrations of 200 to 400 mg L -1 respectively, without leaf drop. Application of NAA did not promote chemical fruit thinning whereas ethephon showed high percentage of fruit thinning after full bloom with increased concentrations.

show abstract

“…In addition, pruning for cropload reduction is likely to delay canopy development in young orchards (Stover et al, 2002a). Use of 1-naphthaleneacetic acid (NAA) during early fruit devel-opment has been reported to reduce cropload and increase fruit size for various citrus cultivars in diverse growing regions (Brar et al, 1992;Farmahan, 1992;Gallasch, 1988;Greenberg et al, 1992;Hield et al, 1962;Iwahori, 1978;Ortolá et al, 1991;Sharma et al, 1993;Wheaton, 1981). Although NAA has been labeled for thinning of many Florida citrus varieties for more than 20 years, it has received little commercial use.…”

mentioning

confidence: 99%

Fruit Size and Yield of Mandarins as Influenced by Spray Volume and Surfactant Use in NAA Thinning

Stover¹,

Ciliento²,

Myers³

et al. 2006

HortSci

View full text Add to dashboard Cite

Six trials were conducted to determine whether lower spray volumes or inclusion of different surfactants would permit adequate thinning of mandarin hybrids (Citrus reticulata hybrids) at a much lower cost per hectare. Sprays were applied using a commercial airblast orchard sprayer during physiological drop when fruitlets averaged 8 to 16 mm in diameter. Surfactant was always included at 0.05% v/v. NAA always reduced fruit per tree, increased fruit size, and decreased production of smallest size fruit. However, in only three experiments, contrast of all NAA treatments vs. controls indicated increased production of the largest (80–100 fruit per carton) and most valuable fruit. In four of five experiments, comparison of spray volumes of 600 (only examined in three of four experiments), 1200, or 2300 L·ha–1 demonstrated significant fruit size enhancement from all NAA applications. Most individual NAA treatments resulted in fewer fruit per tree, but there were no statistically significant differences between NAA treatments at different spray volumes. In only one of the four experiments, there was a marked linear relationship between spray volume and fruit per tree, yield, mean fruit size, and production of largest fruit sizes. The effects of surfactants (Activator, a nonionic, Silwet L-77, and LI-700) on NAA thinning were tested in both `Murcott' and `Sunburst'. In comparisons between Silwet L-77 and Activator surfactant, one experiment with `Murcott' showed greater fruit per tree and yield reduction from using Silwet, but with a smaller increase in production of largest fruit sizes, whereas in another `Murcott' experiment, Silwet L-77 reduced numbers of smaller fruit size with no increase in production of larger fruit. Based on these findings, current recommendations for NAA thinning of Fla. mandarins are use of spray volume of ≈1100–1400 L·ha–1 on mature trees with proportionally lower volume on smaller trees. These data appear to support use of a nonionic surfactant rather than other tested surfactants in NAA thinning of Florida mandarins. Because experience with NAA thinning of Florida citrus is limited, it is only recommended where the disadvantages of overcropping are perceived to substantially outweigh the potential losses from overthinning.

show abstract

Chemical Thinning of Kinnow Mandarin

Cited by 5 publications

References 0 publications

Fixação e desenvolvimento dos frutos do tangor 'Murcote' (Citrus reticulata Blanco x Citrus sinensis L. Osbeck) e da lima ácida 'Tahiti' (Citrus latifolia Tanaka) com a utilização de biorreguladores.

Fixação e desenvolvimento dos frutos do tangor 'Murcote' (Citrus reticulata Blanco x Citrus sinensis L. Osbeck) e da lima ácida 'Tahiti' (Citrus latifolia Tanaka) com a utilização de biorreguladores.

Reguladores vegetais e o desbaste químico de frutos de tangor murcote

Fruit Size and Yield of Mandarins as Influenced by Spray Volume and Surfactant Use in NAA Thinning

Contact Info

Product

Resources

About