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Long-term Effect of Winter Gibberellic Acid Sprays and Auxin Applications on Crop Value of `Clausellina' Satsuma

2006; American Society for Horticultural Science; Volume: 131; Issue: 5 Linguagem: Inglês

10.21273/jashs.131.5.586

2327-9788

Amílcar Duarte, Amparo García-Luis, R.V. Molina, Consuelo Monerri, Vicente Navarro, Sergio G. Nebauer, Manuel Sánchez-Perales, José Luı́s Guardiola,

Horticultural and Viticultural Research

A winter gibberellic acid (GA 3 ) spray consistently reduced flower formation, but had a variable effect on the amount of first-grade fruit in the early harvest of `Clausellina' satsuma ( Citrus unshiu Marc.), and in the long term these applications had no significant effect on the value of the crop. Auxin applications increased the amount of first grade-early harvested fruit, and increased crop value as compared to hand-thinned trees. No significant differences in yield or fruit grade could be found among the different auxin applications tried, namely an application of 20 mg·L -1 2,4-dichlorophenoxyacetic acid (2,4-D) at flowering, or applications of 25 mg·L -1 naphthaleneacetic acid (NAA), or 50 mg·L -1 2,4-dicholorophenoxypropionic acid (2,4-DP) at the end of fruitlet abscission. Apart from their effect on size, the auxin applications had only a marginal effect on fruit quality.