The long-term application of compost and biogas residue fertilizers enhances soil qualities in rambutan orchards

Context Perennial fruit orchards in the Mekong Delta, Vietnam, are increasingly constrained by soil degradation and declining fertility on acid sulfate soils. Excessive reliance on inorganic fertilizers exacerbates soil acidification and nutrient depletion, limiting rambutan (Nephelium lappaceum L.) productivity. Aims This study aims to assess the long-term effects of integrating organic amendments with inorganic fertilization on soil properties and yield in a 17-year-old rambutan orchard on End