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<p>Farmers have intense production schedules dictated by the need to compensate for reduced profit margins per unit area under cultivation. Synthetic fertilizers currently ensure the economic sustainability of their farms. The environmental benefits of fully or partially replacing chemical fertilizers with compost are not a sufficient incentive to convince farmers to adopt compost in their farm strategies. The objective of this work was to determine the production and quality differences in lettuce (<i>Lactuca sativa</i> L.) in relation to compost type and application rate. For this purpose, two different composts were produced by mixing (in two different ratios) fennel production waste with coffee waste and applied at 4 rates (0%, 1%, 5%, and 10% <i>v/v</i>). Rather than compost type, soil chemical parameters in our study were influenced by the application rate, as well as lettuce yield and physiological response. Plants treated with 10% compost showed signs of stress (reduced stomatal conductance and increased dry matter), probably driven by the high electrical conductivity in the soil. The application of the intermediate rate (5%), on the other hand, promoted increased biomass production despite the reduction in leaf nitrate content. In conclusion, the use of the wastes (fennel and coffee husks), regardless of production time and mixing ratio, does not significantly alter the production and quality characteristics of lettuce. Therefore, the main determining factor was the application rate.</p>

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Compost amount, rather than composition, determines lettuce growth, physiology, and soil mineral content

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Emanuela Campana,
  • Michele Ciriello,
  • Sergio Saia,
  • Luigi Duri,
  • Mariavittoria Verrillo,
  • Antonio Caporale,
  • Antonio Pannico,
  • Giulia Graziani,
  • Youssef Rouphael,
  • Stefania De Pascale

摘要

Farmers have intense production schedules dictated by the need to compensate for reduced profit margins per unit area under cultivation. Synthetic fertilizers currently ensure the economic sustainability of their farms. The environmental benefits of fully or partially replacing chemical fertilizers with compost are not a sufficient incentive to convince farmers to adopt compost in their farm strategies. The objective of this work was to determine the production and quality differences in lettuce (Lactuca sativa L.) in relation to compost type and application rate. For this purpose, two different composts were produced by mixing (in two different ratios) fennel production waste with coffee waste and applied at 4 rates (0%, 1%, 5%, and 10% v/v). Rather than compost type, soil chemical parameters in our study were influenced by the application rate, as well as lettuce yield and physiological response. Plants treated with 10% compost showed signs of stress (reduced stomatal conductance and increased dry matter), probably driven by the high electrical conductivity in the soil. The application of the intermediate rate (5%), on the other hand, promoted increased biomass production despite the reduction in leaf nitrate content. In conclusion, the use of the wastes (fennel and coffee husks), regardless of production time and mixing ratio, does not significantly alter the production and quality characteristics of lettuce. Therefore, the main determining factor was the application rate.