Summer Stress Mitigation in Rainfed Olive Trees Across Multiple Sites: Comparative Effects on Yield and Oil Quality of Glycine Betaine, Kaolin, and Calcium Carbonate in “Koroneiki” and “Lianolia Kerkyras” Cultivars

April 22, 2026PlantsOpen Access

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Key Points

The research aimed to assess how foliar applications of glycine betaine, kaolin, and calcium carbonate mitigate summer stress in olive trees.
Conducted across three Greek sites with 'Koroneiki' and 'Lianolia Kerkyras' cultivars
Applied foliar treatments during summer and measured fruit yield, oil content, and quality parameters
Compared efficacy of treatments under different environmental conditions
Glycine betaine increased fruit yield to 24.37 Kg and oil to 4.69 Kg per tree under harsh conditions
Kaolin showed a 43% to 52.8% increase in yield and oil mass for 'Koroneiki', and 30% to 34% for 'Lianolia Kerkyras'
Calcium carbonate had limited effects on productivity and quality, with oils classified as extra virgin.

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Evaluates the effects of foliar treatments on olive tree yield and oil quality under summer stress, indicating sustainable practices for resilience.

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Roussos et al. (2026) studied this question.

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