Background and aims Alkaline dispersive subsoils often contain a range of physicochemical constraints that restrict root growth and limit accessibility to subsoil resources. Co-application of inorganic and organic matter (OM) demonstrated a synergistic effect on improving structural stability of alkaline dispersive subsoils. This study aims to quantify this synergistic effect on soil physicochemical and biological properties,...

Background and aims Alkaline dispersive subsoils are characterised by multiple physicochemical constraints that limit plant water and nutrient acquisition. Subsoil amelioration through organic amendments (OAs) requires significant financial investment. Whereas large yield responses can result following amelioration, sometimes small or even negative yield responses can occur, resulting in a significant net financial loss for th...