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<p>Over recent decades, soil fertility across West Africa has progressively declined due to unsustainable land management practices, resulting in reduced agricultural productivity and crop yields. To address this challenge, the adoption of sustainable techniques such as agroforestry has become increasingly critical. This study aimed to evaluate the effects of biochar and <i>Gliricidia sepium</i> biomass amendments on the performance of <i>Sorghum bicolor</i> within different agroforestry tree species environment. A split-plot experimental design was implemented, comprising three blocks, each associated with a distinct tree species: <i>Parkia biglobosa</i>, <i>Vitellaria paradoxa</i>, and <i>Lannea microcarpa</i>. Within each block, four soil amendment treatments (control, <i>Gliricidia</i> biomass, biochar, and <i>Gliricidia</i> + biochar) were applied in concentric zones located beneath and outside the tree canopy. A generalized linear mixed-effects model was used to analyze leaf number variation, while a linear mixed-effects model assessed the impact of amendments on sorghum growth and yield parameters. The findings revealed that the spatial position within the agroforestry tree environment significantly influenced sorghum performance. The highest grain yields were recorded under <i>Parkia biglobosa</i>, whereas <i>Vitellaria paradoxa</i> and <i>Lannea microcarpa</i> were associated with reduced plant height, leaf number, and grain weight. Although soil nitrogen content and water retention were not directly measured, the positive effects of the combined amendment are consistent with previously reported improvements in nutrient availability and soil physical properties. Overall, these findings highlight the importance of tree species selection and integrated soil amendment strategies in enhancing sorghum productivity within agroforestry parkland systems on degraded soils.</p>

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Effects of amendment of biochar and Gliricidia sepium biomass on growth and yield of Sorghum bicolor under different agroforestry parklands in Northern Benin

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Amos Baninwain Nambima Dene,
  • Narcisse Yehouenou,
  • Abdoul Sodick Alassiri,
  • Thierry Dèhouégnon Houehanou,
  • Gerard Nounagnon Gouwakinnou

摘要

Over recent decades, soil fertility across West Africa has progressively declined due to unsustainable land management practices, resulting in reduced agricultural productivity and crop yields. To address this challenge, the adoption of sustainable techniques such as agroforestry has become increasingly critical. This study aimed to evaluate the effects of biochar and Gliricidia sepium biomass amendments on the performance of Sorghum bicolor within different agroforestry tree species environment. A split-plot experimental design was implemented, comprising three blocks, each associated with a distinct tree species: Parkia biglobosa, Vitellaria paradoxa, and Lannea microcarpa. Within each block, four soil amendment treatments (control, Gliricidia biomass, biochar, and Gliricidia + biochar) were applied in concentric zones located beneath and outside the tree canopy. A generalized linear mixed-effects model was used to analyze leaf number variation, while a linear mixed-effects model assessed the impact of amendments on sorghum growth and yield parameters. The findings revealed that the spatial position within the agroforestry tree environment significantly influenced sorghum performance. The highest grain yields were recorded under Parkia biglobosa, whereas Vitellaria paradoxa and Lannea microcarpa were associated with reduced plant height, leaf number, and grain weight. Although soil nitrogen content and water retention were not directly measured, the positive effects of the combined amendment are consistent with previously reported improvements in nutrient availability and soil physical properties. Overall, these findings highlight the importance of tree species selection and integrated soil amendment strategies in enhancing sorghum productivity within agroforestry parkland systems on degraded soils.