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- W2131145704 abstract "Alternate bearing is one of the major challenges facing olive growers. High fruit set in an “on” season decreases flower initiation thereby resulting in a subsequent “off” season. Early fruit thinning in an “on” season with naphthalene acetic acid (NAA) is used in some olive growing countries to reduce fruit numbers and increase fruit size in the “on” season, and to ensure adequate fruit numbers in what otherwise would have been the subsequent “off” season. However, NAA has not been used for olive thinning in South Africa and the effective concentrations for local conditions and cultivars are not known. ‘Barouni’ olives are grown for table purposes only as the amount of oil accumulated in fruit are low. Therefore, fruit quality is determined mainly by fruit size. In the current study, NAA was applied to ‘Barouni’ olive trees at 100, 150 and 200 mg L -1 in the 2007/08 season. NAA on average decreased the estimated total fruit number by 19.1% and reduced yield by 11.8%. The decrease in fruit numbers resulted in a significant increase in fruit size – the percentage fruit in the jumbo (>5.4 g) category was 9.9% higher compared to the control. Although there was no differential payment according to fruit size in the 2007/2008 season, the increase in fruit size is important since larger ‘Barouni’ olives generally sells for higher prices. Despite a significant decrease in yield and increase in fruit size compared to the control, the subsequent “off” season yield (2008/09) was not affected by any of the treatments. This was probably due to the mild thinning effect of the NAA concentrations evaluated. In summary, it seems that effective NAA concentrations for optimal thinning of ‘Barouni’ under South African conditions might be higher compared to optimal concentrations (120 150 mg L -1 ) used in California." @default.
- W2131145704 created "2016-06-24" @default.
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- W2131145704 date "2012-12-01" @default.
- W2131145704 modified "2023-09-27" @default.
- W2131145704 title "Managing olive yield and fruit quality under South African conditions" @default.
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