Soil types influence early shoot and root growth of Neolamarckia macrophylla (Roxb.) Bosser (Red laran) seedlings

Abstract Neolamarckia macrophylla , commonly referred to as red laran, has not been extensively studied in Sabah, Malaysia. This species is known for its rapid maturation and pest resistance, making it a viable option for plantations because of its adaptability and profitability. This study examined the growth of N. macrophylla in cocopeat, poor soil, topsoil, and organic amendments under rhizotron conditions. The application of cocopeat enhanced the root size and morphology through soil moisture retention and facilitating adequate aeration. Notably, nutrient-deficient soils caused the seedlings to develop thicker stems and larger leaves, indicating the plant’s resilience in nutrient-poor environments. Optimal root development was observed when the topsoil was combined with rice husk. These findings suggest that N. macrophylla is well-suited for reforestation and land rehabilitation, particularly when appropriate soil amendments are utilised.