USE OF PLANT GROWTH REGULATORS AND CONTROL OF ALTERNATE BEARING ON OLIVE (1990)| Zeytincilik Araştırma Enstitüsü

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Proje adı : USE OF PLANT GROWTH REGULATORS AND CONTROL OF ALTERNATE BEARING ON OLIVE (1990)

Hazırlayanlar : Mustafa AKILLIOĞLU Nejat ÖZİLBEY Belgin AYKAS Bilman YÜCE

Several trials were carried out in this project between 1984 and 1989 in order to study the use of different plant growth regulators for the control of flower and fruit numbers on the olive tree so as to diminish the alternate bearing. In 1984 and 1986 on-years, various concentrations of NAA and TIBA some months before flowering and of NAA, TIBA and CEPA at full bloom and 14 days after full bloom were applied in Domat variety. Trial was planned in Randomised Blocks Design System with 3 replicates, as each parcel is a single tree. In 1988 on-year trees were treated with four different concentrations of NAA at full bloom and 14 days after full bloom in Domat and Uslu varieties. Trial was planned in Randomised Blocks Desing System with 4 replicates, as each parcel is a single tree. At the end of on-year trials in Domat variety, full bloom stage was found as the most suitable period for fruit thinning. NAA, applied at this stage increases the size of remained fruits by causing an important fruit drop. It also makes a slight increase in the oil ratio of the fruits. NAA applied 14 days after full bloom only increases the size of the fruits. On the contrary, TIBA and CEPA sprayed at full bloom caused a slight increase in the fruit set in Domat variety. In Domat and Uslu varieties it was found that NAA treatments clearly decreased the amount of crop per tree and increased the fruit quality in 1988. Full bloom in Domat and 14 days after full bloom in Uslu give better results than the treatments applied in the other stages. A single 250-300 ppm NAA application that is hopeful in controlling alternate bearing in Domat is advisable for fruit thining in both of these varieties. the off- years it was also found that GA3 did not increase the fruit set in Domat variety at the studied concentrations.