This study investigates the effects of biochar and biochar-enriched compost on soil and crop health, focusing on soil properties and the growth of pineapple plants.

Results indicate that the application of biochar, both independently and in combination with compost, led to significant improvements in soil quality, including a 9.16% increase in soil pH, a 13.81% increase in cation exchange capacity (CEC), and enhanced nutrient retention. Treated soils exhibited higher organic matter content (4.26%) compared to untreated soils (2.97%), along with elevated levels of macronutrients like potassium, calcium, and magnesium. Micronutrient analysis revealed increased levels of iron and zinc, while sodium and manganese levels decreased. In terms of crop health, biochar-enriched compost positively influenced the Green Area Index (GAI) of pineapple plants, with a marginally significant increase in GAI observed at six weeks following higher biochar application rates. Notably, the greatest GAI increase was observed in the biochar-only treatment, showing an 11.96% improvement.

These findings suggest that biochar, both alone and in combination with compost, has the potential to enhance both soil fertility and crop growth. Further studies, including long-term monitoring and optimisation of application rates, are recommended to maximise its benefits.