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

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 t...

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Bibliographic Details
Published inJournal of the American Society for Horticultural Science Vol. 131; no. 5; pp. 586 - 592
Main Authors Duarte, A.M.M, Garcia-Luis, A, Victoria Molina, R, Monerri, C, Navarro, V, Nebauer, S.G, Sanchez-Perales, M, Guardiola, J.L
Format Journal Article
LanguageEnglish
Published 01.09.2006
Subjects
2,4-D
2,4-dichlorophenoxypropionic acid
abscission
application timing
auxins
citrus fruits
Citrus unshiu
economic impact
flowering
fruit quality
gibberellic acid
long term experiments
naphthaleneacetic acid
plant growth control
profitability
Spain
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Summary: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.
ISSN:0003-1062
2327-9788
DOI:10.21273/JASHS.131.5.586