Improving the size of ‘Fortune’ mandarin fruits by the auxin 2,4-DP

El-Otmani, M.; Agustí, Manuel; Satorre, M. Á.; Almela, V.

doi:10.1016/0304-4238(93)90039-s

Cited by 39 publications

(29 citation statements)

References 7 publications

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“…Juice content was high and similar to that reported by El-Otmani et al (1993) (Table 6). Acidity was also high, but with values considered normal for this variety (Bono et al, 1985).…”

Section: Analysis Over Three Seasonssupporting

confidence: 88%

Effect of mechanical pruning on the yield and quality of ‘Fortune’ mandarins

Martín-Górriz

Castillo²,

Torregrosa

2014

Span. j. agric. res.

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This work compares mechanical pruning followed up by hand pruning versus manual pruning in the case of ‘Fortune’ mandarins. Yield and fruit quality were measured over a three-year period. Two mechanical pruning intensities were tested, these intensities being measured as the width of the row middles left free after mechanical pruning. Although there were differences in biomass and diameter of the branches that were cut, no differences were observed between the two mechanical pruning intensities in terms of yield or fruit quality. In all pruning treatments, fruit size reached the highest category. The pruning treatments consisted in: (i) hand pruning every year, (ii) mechanical pruning followed up by hand pruning every year, and (iii) alternating the two previous methods over the years studied. On analysing the accumulated fruit production of the three years, it can be observed that there were no significant differences in yield when mechanical pruning was alternated with hand pruning over the years. When only mechanical pruning was used for the three years, however, a 22% reduction in yield was observed with respect to the treatment involving hand pruning alone. From the economic point of view, mechanical pruning shortened the time needed to complete the follow-up hand pruning by 13% with respect to just hand pruning, but this reduction in labour does not offset the cost of the mechanical equipment.

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“…Juice content was high and similar to that reported by El-Otmani et al (1993) (Table 6). Acidity was also high, but with values considered normal for this variety (Bono et al, 1985).…”

Section: Analysis Over Three Seasonssupporting

confidence: 88%

Effect of mechanical pruning on the yield and quality of ‘Fortune’ mandarins

Martín-Górriz

Castillo²,

Torregrosa

2014

Span. j. agric. res.

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“…Specifically, treatment with 2,4-DP increased the number of large fruits and reduced the number of fruits with a diameter B65 mm. In previous studies, fruits harvested from trees treated with 2,4-DP were significantly larger than that of the control trees, indicating that the application of 2,4-DP and 2,4-D increased fruit size (Hield & Erickson 1962;El-Otmani et al 1993;Erner et al 1993;Agustı´et al 1996;Greenberg et al 1996;Koch et al 1996;Gravina et al1998;Mesejo et al 2003;Chao et al 2004;Erner et al 2004;Fang et al 2008). 2,4-DP has given good results in increasing the fruit size of various citrus varieties without any significant thinning effects (Vanniere & Arcuset 1989;Agustı´& Almela 1991).…”

Section: Discussionmentioning

confidence: 99%

“…2,4-DP has given good results in increasing the fruit size of various citrus varieties without any significant thinning effects (Vanniere & Arcuset 1989;Agustı´& Almela 1991). Also, according to El-Otmani et al (1993), 2,4-DP improved fruit size by affecting juice sac development through an enhancement of cell enlargement rather than cell division. Similar results have also been reported for other auxins.…”

Section: Discussionmentioning

confidence: 99%

“…Applying synthetic auxins during the cell division stage of fruit development significantly reduces the number of fruits and increases the final fruit size by reducing the competition for carbohydrates between fruitlets (Agustı´et al 1995). Synthetic auxins such as 2,4-dichlorophenoxy acetic acid (2,4-D), 2,4,5-trichlorophenoxy acetic acid (2,4,5-T), naphthalene acetic acid (NAA) and 2,4-dichlorophenoxypropionic acid (2,4-DP) have been shown to increase fruit size (Stewart et al 1952;El-Zeftawi 1976;Guardiola et al 1988;El-Otmani et al 1993;Agustıé t al. 1994).…”

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confidence: 99%

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Effects of 2,4-DP (2,4-dichlorophenoxypropionic acid) plant growth regulator on fruit size and yield of Valencia oranges (Citrus sinensisOsb.)

Yıldırım

Yeşiloğlu

İncesu

et al. 2012

New Zealand Journal of Crop and Horticultural Science

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The Valencia orange is a high-quality fruit grown in Turkey; however, small fruit sizes and high fruit discard percentages are common in Valencia oranges. Small fruit size is the main factor limiting the marketing of Valencia oranges; thus, synthetic auxins are commonly used to enhance the size of citrus fruit. The objective of the present study was to observe the effects of 2,4-dichlorophenoxypropionic acid (2,4-DP) on the fruit size, yield and quality of Valencia oranges from 29-year-old trees budded on sour orange rootstock in Adana, Turkey during 2005Á06. Three concentrations (50, 100 and 150 ppm) of 2,4-DP were applied during the June drop, when the mean fruit diameter was 13Á15 mm. The results indicated that the application of 2,4-DP increased the fruit size of Valencia oranges without reducing yield. The application had a significant effect on fruit yield. Compared with the control trees, applications of 2,4-DP increased the number of large, commercially valuable Valencia oranges (75Á80 mm). Moreover, an increase in the concentration of 2,4-DP increased the yield and weight of the fruits. As a result, fruit retention was highest in trees sprayed with 150 ppm 2,4-DP. Except for the titratable acid content (TA), which increased with an increase in the 2,4-DP concentration, the internal characteristics of the fruit were not affected by treatment with 2,4-DP. Thus, the results of the present study revealed that 2,4-DP can be used to improve the fruit size of Valencia fruitlets during the June drop.

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“…This expansion is probably due to an increase in cell vacuolisation that, in turn, increases vesicle size, locule dimensions and final fruit size (El-Otmani et al, 1993;Guardiola and Lazaro, 1987).…”

Section: Table1 Effect Of Pgr and Urea On Plant Height And Canopy Spmentioning

confidence: 99%