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<p>The application of digestate from anaerobic digestion offers a sustainable alternative to mineral fertilizers for enhancing soil fertility and crop productivity. This study evaluated the effects of increasing digestate doses (10, 20, 30, and 40 t ha<sup>-1</sup> on a dry weight basis (DW t/ha)) on soil fertility parameters and potato (<i>Solanum tuberosum</i> L. cv. Laura) yield under semi-arid Moroccan conditions. Results showed that the highest dose (40 DW t/ha) increased total tuber yield by 133% and marketable yield by 160% compared to the control, outperforming mineral fertilization. Digestate application improved key growth traits, including stem number (up to 4.13 per plant) and leaf dimensions (up to 32.4&#xa0;cm × 25.6&#xa0;cm), particularly at higher doses. Soil analysis revealed a dose-dependent decline in pH (from 7.90 to 7.61), a 116% rise in electrical conductivity, and a substantial increase in mineral nitrogen (up to 650%), phosphorus (64%), and potassium availability. Starch yield peaked with moderate digestate rates (36–37% increase), matching or exceeding mineral fertilization performance. These findings demonstrate digestate’s potential as an efficient organic fertilizer that enhances potato productivity and supports agroecological practices aligned with Morocco’s sustainability goals.</p>

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Evaluating Digestate as a Sustainable Fertilizer: Effects of Different Application Rates on Potato Yield and Soil Fertility in Morocco

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Jalal Hsaine,
  • Salah-Eddine Laasli,
  • Rachid Lahlali,
  • Fouad Rachidi

摘要

The application of digestate from anaerobic digestion offers a sustainable alternative to mineral fertilizers for enhancing soil fertility and crop productivity. This study evaluated the effects of increasing digestate doses (10, 20, 30, and 40 t ha-1 on a dry weight basis (DW t/ha)) on soil fertility parameters and potato (Solanum tuberosum L. cv. Laura) yield under semi-arid Moroccan conditions. Results showed that the highest dose (40 DW t/ha) increased total tuber yield by 133% and marketable yield by 160% compared to the control, outperforming mineral fertilization. Digestate application improved key growth traits, including stem number (up to 4.13 per plant) and leaf dimensions (up to 32.4 cm × 25.6 cm), particularly at higher doses. Soil analysis revealed a dose-dependent decline in pH (from 7.90 to 7.61), a 116% rise in electrical conductivity, and a substantial increase in mineral nitrogen (up to 650%), phosphorus (64%), and potassium availability. Starch yield peaked with moderate digestate rates (36–37% increase), matching or exceeding mineral fertilization performance. These findings demonstrate digestate’s potential as an efficient organic fertilizer that enhances potato productivity and supports agroecological practices aligned with Morocco’s sustainability goals.