Abstract Aimed at addressing the constraints of farmland soil acidification on soil health and crop productivity in southern Henan Province, this study investigated the comprehensive ameliorative effects of different soil conditioners and identified the optimal amendment strategy. Based on a continuous fixed-point field experiment conducted from 2023 to 2025, treatments including NB (nitrogen fertilizer + biochar), NL (nitrogen fertilizer + lime), NM (nitrogen fertilizer + microbial fertilizer),