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<p>In Mediterranean regions, water scarcity is an increasingly critical challenge. At the same time, large volumes of olive tree byproducts are often underutilized. One promising strategy is the conversion of olive tree by-products into soil amendments, such as biochar and compost. This work aims to study the responses of the two olive varieties Chemlali and Koroneiki cultivated on two water conditions: one with continuous irrigation and another with drought introduced during a summer month (July). For each irrigation treatment, three different soil treatments have been established: sandy soil, sandy soil amended with biochar, and sandy soil amended with compost. Results showed that trees planted in biochar-amended soil seem to be less stressed under the drought conditions. In this case, leaf water potential was equal to -0.8&#xa0;MPa for Chemlali and −1.1&#xa0;MPa for Koroneiki, whereas for non-amended soil-induced drought, leaf water potential was about −2.36&#xa0;MPa and −2.2&#xa0;MPa, respectively, for Chemlali and Koroneiki. As leaf water potential tendency, crop water stress index was lower under amended biochar treatment and trees seem to be adapted to water stress. Both carbohydrates status and total phenols showed the lowest values for stressed plants in biochar even for both varieties. The most important identified phenols were the oleuropein, the flavonoids like the luteolin-7-glucoside, luteolin-7-rutinioside, and apigenin-7-glucoside, and the verbascoside and increased in induced drought conditions and more specifically in compost-amended soil. Biochar showed less accumulation of identified phenols. It seems to be a promise adaptive solution to water stress.</p>

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Enhanced drought tolerance of young olive trees (Olea europaea L.) on amended sandy soil

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Amel Mguidiche,
  • Mouna AÏachi Mezghani,
  • Imen Zouari,
  • Boutheina Douh,
  • Soumaya Dbara,
  • Beligh Mechri

摘要

In Mediterranean regions, water scarcity is an increasingly critical challenge. At the same time, large volumes of olive tree byproducts are often underutilized. One promising strategy is the conversion of olive tree by-products into soil amendments, such as biochar and compost. This work aims to study the responses of the two olive varieties Chemlali and Koroneiki cultivated on two water conditions: one with continuous irrigation and another with drought introduced during a summer month (July). For each irrigation treatment, three different soil treatments have been established: sandy soil, sandy soil amended with biochar, and sandy soil amended with compost. Results showed that trees planted in biochar-amended soil seem to be less stressed under the drought conditions. In this case, leaf water potential was equal to -0.8 MPa for Chemlali and −1.1 MPa for Koroneiki, whereas for non-amended soil-induced drought, leaf water potential was about −2.36 MPa and −2.2 MPa, respectively, for Chemlali and Koroneiki. As leaf water potential tendency, crop water stress index was lower under amended biochar treatment and trees seem to be adapted to water stress. Both carbohydrates status and total phenols showed the lowest values for stressed plants in biochar even for both varieties. The most important identified phenols were the oleuropein, the flavonoids like the luteolin-7-glucoside, luteolin-7-rutinioside, and apigenin-7-glucoside, and the verbascoside and increased in induced drought conditions and more specifically in compost-amended soil. Biochar showed less accumulation of identified phenols. It seems to be a promise adaptive solution to water stress.