Cianamida hidrogenada no raleio químico de flores e frutos de pessegueiros (Prunus persica, L. Batsch) cv. Eldorado

Rodrigues, Andressa Peripolli; Ferri, Valdecir Carlos; Schwartz, Elisane; Fachinello, José Carlos

doi:10.1590/s0103-84781999000400009

Cited by 3 publications

(6 citation statements)

References 2 publications

(1 reference statement)

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“…Treatments with fruit index similar to that of manual thinning (12.8%) were 0.6 and 0.8% CH 2 N 2 application at 50% fl owering and 0.4% CH 2 N 2 application at 100% fl owering, with percentages of 15.2, 13.4 and 10.9%, respectively ( Figure 1B). FALLAHI et al (1998) andRODRIGUES et al (1999) reported that increasing the CH 2 N 2 concentration increases fl ower thinning and decreases the fruit index, and our fi ndings are in line with those previously reported. A lower fruit index at 0.6 and 0.8% CH 2 N 2 application at 100% fl owering is a result of the high dose when a large number of fl owers are open and perhaps thinned by the chemical.…”

Section: Resultssupporting

confidence: 93%

“…In studies using CH 2 N 2 for peach fl ower thinning, the mean fruit mass also increased with the CH 2 N 2 concentration, confi rming that the increase in CH 2 N 2 dose resulted in a stronger thinning effect, lower production, and larger fruits (MARODIN et al, 1994;FALLAHI, 1997;RODRIGUES et al, 1999;COUTINHO, 2001). The lower number of fruits in the plant enables production of fruits with a higher mean mass due to the increased availability and allocation of nutrients to each fruiting organ (GIOVANAZ et al, 2016).…”

Section: Resultsmentioning

confidence: 95%

“…In studies conducted in Marli, Redhaven, Flavorcrest, Eldorado and Diamante peach cultivars, the viability of using hydrogen cyanamide as a dormancy-breaking chemical and fl ower bud thinner was investigated (MARODIN et al, 1994;FALLAHI, 1997;FALLAHI et al, 1998;RODRIGUES et al, 1999;COUTINHO, 2001). From several reports, it is clear that the choice of product, season of application, concentration, environmental conditions, and cultivar are crucial for the success of this practice.…”

Section: Introductionmentioning

confidence: 99%

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Chemical thinning of flowers and fruits of the peach cultivar Coral with hydrogen cyanamide

Anzanello¹,

Tedesco²

2017

Cienc. Rural

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Chemical treatment is a mean to accomplish fruit thinning; although its efficiency depends on the compound used, application time, and dosage. Effect of the chemical hydrogen cyanamide (CH2N2) on the thinning of flowers and fruits of the peach cultivar Coral was assessed in this study. Treatments consisted of five doses of CH2N2 (0, 0.2, 0.4, 0.6, and 0.8%) spray application to the point of run-off, at two stages (50% and 100% flowering). The experiment was conducted in a completely randomized design with six replicates and one plant per plot. The following parameters were assessed: percentage of flowers thinned at 25 days after spraying, percentage of fruits thinned, fruiting index, production per plant, fruit mass, diameter and length, flesh firmness, soluble solids (SS) and titratable acidity (TA). Concentrations of 0.6 and 0.8% CH2N2application at 50% flowering resulted in thinning 84.4 and 84.7% of the flowers and 0.4% CH2N2 at 100% flowering thinned 87.3%, values close to index assessed in manual thinning (88.0%) experiments. The highest production per plant was recorded for treatments with CH2N2 application at 50% flowering, resulting from a high percentage of flowers opening after spraying the chemical thinner. As such, flowers opening late were not affected by the chemical, thereby ensuring a higher fruiting index. Peach yield with 50% CH2N2 was not significantly different from yield observed for manual treatment, and 0.6% spray was reported to be the optimal dosage. Treatment with 0.6% CH2N2 application at 50% flowering was not significantly qualitatively different from manual thinning. CH2N2 application is efficient for the thinning of ‘Coral’ peach flowers and fruits.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Chemical thinning of flowers and fruits of the peach cultivar Coral with hydrogen cyanamide

Anzanello¹,

Tedesco²

2017

Cienc. Rural

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“…Gabardo et al (2017) also observed that soluble solid contents of apples are affected by the use of metamitron in plant thinning and by the period of application. Other studies using chemical thinners in peach trees did not find alteration of total soluble solids, pulp firmness and color index of 'Eldorado' peach fruits (Rodrigues et al, 1999). Results do not enable to establish a direct relation with periods of metamitron application because of the crop conditions.…”

Section: Soluble Solidmentioning

confidence: 59%

“…There was no difference between the epidermis color of fruits thinned by metamitron and the one of fruits which were manually thinned. Likewise, other studies of chemical thinning agents in peach trees did not find any changes in fruit color (Rodrigues et al, 1999). Changes in peach color are directly related to the genotype (Mayer et al, 2008), fruit ripening stage (Mathias et al, 2008), green pruning management (Gonçalves et al, 2014), amount of plant available water and the relation between fruits and sunlight (Alcobendas et al, 2013).…”

Section: Colorimetry Of the Peelmentioning

confidence: 84%

Influence of the Period of Peach Tree Chemical Thinning on Fruit Quality

Barreto¹,

Farias²,

Zandoná³

et al. 2019

JAS

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The need to decrease production costs along with the lack of man power in the countryside has asked for cultural practices which lead to these factors, such as thinning. Thus, chemical thinning has been studied as an alternative to fruit manual thinning. Therefore, this study aimed at evaluating the quality of peach tree fruits after chemical thinning with metamitron at different time periods in the south of Brazil. The experiment was carried out in a commercial peach tree orchard with cultivars ‘Maciel’ in Morro Redondo, Rio Grande do Sul state, Brazil, from 2015 to 2016. Treatments consisted in the application of metamitron (doses of 200 mg L-1) on the 20th, 30th, 40th, 50th and 60th day after full bloom (DAFB) and manual thinning on the 40th DAFB. Epidermis color, pulp firmness, ripeness index, soluble solids, titratable acidity, juice pH, total phenolic compounds and antioxidant activity were evaluated. The application of metamitron in peach tree thinning did not affect peach color. Changes in the other variables related to the quality of fruits depended on the application period of metamitron in the thinning process and between crops.

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Ethephon no raleio químico de frutos de pessegueiro cultivar Chimarrita

Anzanello

Tedesco

2020

R. Eletr. Cient. da Uergs

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O raleio é uma das principais práticas culturais do pessegueiro, podendo ser realizada de maneira manual ou química. Este estudo objetivou avaliar o efeito de ethephon como raleante químico de frutos da cultivar de pessegueiro Chimarrita. O experimento consistiu na aplicação de ethephon nas doses de 0, 50, 80, 110 and 140 mg L-1, por pulverização até o ponto de gotejo, e de um tratamento de raleio manual, todos realizados em 10/09/2015, em pomar comercial localizado em Veranópolis-RS. O delineamento experimental foi completamente casualizado com seis repetições e uma planta por parcela. As avaliações ocorreram em seis ramos demarcados por planta, totalizando 36 ramos por tratamento. As variáveis analisadas foram: percentual de frutos raleados, índice de frutificação, massa, diâmetro e comprimento de fruto, firmeza de polpa, sólidos solúveis (SS) e acidez titulável (AT). A concentração de ethephon de 80 mg L-1 apresentou taxas de índice de frutificação (21,2%) e de frutos raleados (72,1%) próximos ao tratamento de raleio manual (manejo tomado como referência), com valores obtidos de 22,4% e 75,2%, respectivamente. As características físico-químicas não diferiram entre o tratamento de ethephon 80 mg L-1 e o raleio manual, com massa de fruto e SS de 104,9 g e 8,0 ºBrix para a dose de 80 mg L-1 e 113,1 g e 8,1 ºBrix para o raleio manual. A aplicação de ethephon a dose de 80 mg L-1 mostra-se eficiente para o raleio de frutos de pessegueiro cultivar Chimarrita.

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Cianamida hidrogenada no raleio químico de flores e frutos de pessegueiros (Prunus persica, L. Batsch) cv. Eldorado

Cited by 3 publications

References 2 publications

Chemical thinning of flowers and fruits of the peach cultivar Coral with hydrogen cyanamide

Chemical thinning of flowers and fruits of the peach cultivar Coral with hydrogen cyanamide

Influence of the Period of Peach Tree Chemical Thinning on Fruit Quality

Ethephon no raleio químico de frutos de pessegueiro cultivar Chimarrita

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