N Fertilizer Reduction Combined with Organic Amendment Enhances Soil Multifunctionality by Altering Nutrient Availability and Fungal Community Structure in an Intensive Grain Production System

How soil ecosystem multifunctionality (EMF) and microbiome in the high-input agricultural system respond to reduced mineral N input (RMNI) and organic fertilization (OF) remains not completely clear. Increasing the knowledge involved will help explore suitable fertilization regime for sustainable land use in intensive production system. Using an intensively cultivated winter wheat and summer maize rotation field receiving long-term high N fertilization, we explored the effect of RMNI and OF on crop productivity and soil physicochemical properties, EMF, and bacterial and fungal communities. Six treatments were employed here: farmers’ N fertilization rate (FNR, as a control), OF and FNR + OF as well as three combinations of RMNI and OF (namely, 80