The Effect of Fruit Chemical Thinning on the Alternate Bearing and Some Vegetative and Reproductive Traits of Native Olive Cultivar in Kermanshah Region (Sarpol Zahab)

In order to investigate the effects of foliar spraying of naphthalene acetic acid (NAA) on the alternate bearing and some vegetative and reproductive traits of native olive cultivars.

This experiment was performed during 2019 and 2020 in the Dalahu Olive Research Station of kermashah province as a factorial experiment based on completely randomized block design with three replications.The first factor was NAA as foliar spraying at three levels (foliar spraying with 150 mg/l), zero concentrations (with distilled water) and no foliar spraying. The second factor was cultivar three native olive cultivars (Deira, Zagros and Meshkat)..

 The results of ANOVA showed that the number of flowers and complete flowers on cluster. cluster and fruit numbers on the branch were affected significantly by tested treatments. The interactive effects of the cultivar and the season was significant at the level of 1% on the Fruit and kernel dimensions, yield and yield efficiency. Foliar spraying in year andcultivar was not significant.

NAA foliar application hads little effect in alternate bearing in studied cultivars. The percentage of oil in wet and dry matter in "on" and "off" years had no significant difference. The fruit yield of the Deira cultivar compared to other cultivars (Zagors and Mashkat). So despite NAA foliar application, the fruit yield per tree was 35.6 kg in the year "on" and 8.5 kg per tree in the year "off" in Meshkat and Zagros cultivars, the yield difference in two years was small.