Long-term effect of winter gibberellic acid sprays and auxin applications on crop value of 'Clausellina' Satsuma.

Duarte, Amílcar; García-Luis, Amparo; Molina, Rosa Victoria; Monerri, Consuelo; Navarro, Vicente; Nebauer, Sergio G.; Sánchez-Perales, Manuel; Guardiola, Jose Luis

http://hdl.handle.net/10400.1/10380

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Authors

Duarte, Amílcar

García-Luis, Amparo

Molina, Rosa Victoria

Monerri, Consuelo

Navarro, Vicente

Nebauer, Sergio G.

Sánchez-Perales, Manuel

Guardiola, Jose Luis

Abstract(s)

A winter gibberellic acid (GA3) 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.