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<p>Several reforestation and afforestation projects suggest using biochar as an alternative to soil amendments for seedling propagation. We tested two types of biochar (from bean straw or cocoa pod husk) at 0, 5, and 10 t/ha, alone or combined with 300&#xa0;kg/ha of Diammonium phosphate (DAP) fertilizer, for five-month nursery production of <i>Eucalyptus grandis</i> and <i>Dacryodes edulis</i>. Growth parameters and total biomass were measured during the trial, from which we evaluated seedling quality using the Dickson Quality Index (DQI) and economic analysis to assess profitability. Regardless of the type of biochar, an increasing dose of biochar combined with DAP improved <i>Eucalyptus</i> height and collar diameter. For <i>Dacryodes</i>, increasing cocoa pod husk biochar led to the maximum height, while the greatest collar diameter was obtained by increasing bean straw biochar dose. Total biomass of <i>Eucalyptus</i> and <i>Dacryodes</i> increased by 68% and 48%, leading seedlings to the highest quality (DQI: 2.52 and 2.03) when 10 t/ha of cocoa pod husk biochar and 300&#xa0;kg/ha DAP + 10 t/ha of biochar were applied, respectively. Using cocoa pod husk-based biochar was sufficient to improve the economic net benefit of <i>Eucalyptus nursery production</i>. However, due to its slower growth, no profit was obtained using biochar treatments for <i>Dacryodes production</i>. Our study suggests that biochar can be adopted for reforestation/afforestation projects to increase seedling quality and income from <i>Eucalyptus</i> production on low fertility soils such as those of the humid highlands of Cameroon.</p>

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Economic potential of biochar for the nursery production of two tropical agroforestry species (Eucalyptus grandis and Dacryodes edulis)

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • Gilles Raoul Meli Lontsi,
  • Boris Merlain Kanouo Djousse,
  • Clémentine Pernot,
  • Alison D. Munson

摘要

Several reforestation and afforestation projects suggest using biochar as an alternative to soil amendments for seedling propagation. We tested two types of biochar (from bean straw or cocoa pod husk) at 0, 5, and 10 t/ha, alone or combined with 300 kg/ha of Diammonium phosphate (DAP) fertilizer, for five-month nursery production of Eucalyptus grandis and Dacryodes edulis. Growth parameters and total biomass were measured during the trial, from which we evaluated seedling quality using the Dickson Quality Index (DQI) and economic analysis to assess profitability. Regardless of the type of biochar, an increasing dose of biochar combined with DAP improved Eucalyptus height and collar diameter. For Dacryodes, increasing cocoa pod husk biochar led to the maximum height, while the greatest collar diameter was obtained by increasing bean straw biochar dose. Total biomass of Eucalyptus and Dacryodes increased by 68% and 48%, leading seedlings to the highest quality (DQI: 2.52 and 2.03) when 10 t/ha of cocoa pod husk biochar and 300 kg/ha DAP + 10 t/ha of biochar were applied, respectively. Using cocoa pod husk-based biochar was sufficient to improve the economic net benefit of Eucalyptus nursery production. However, due to its slower growth, no profit was obtained using biochar treatments for Dacryodes production. Our study suggests that biochar can be adopted for reforestation/afforestation projects to increase seedling quality and income from Eucalyptus production on low fertility soils such as those of the humid highlands of Cameroon.