Soil C and Aggregate Stability Were Promoted by Bio-fertilizer on the North China Plain

Soil fertility can be potentially improved and degradation retarded by replacing some of the chemical fertilizer with bio-fertilizer (BF). To optimize such change, BF was applied at substitution ratios 0% (BF0), 30% (BF30), 50% (BF50), 70% (BF70), 100% (BF100) in a field experiment 2018 2019. organic carbon (C) contents, stability, C contents aggregate fractions were determined 0–20 cm layer. (SOC) increased increase application rates, increases reached to 71.2% 68.2% 2019 BF100 treatment. Water-soluble (WSOC) highest BF50 both years. Microbial biomass (MBC) KMnO4-oxidizable significantly application. The decrease basal respiration largest 26.06% 26.09% Significant mean weight diameter (3.16 mm 3.39 2019) observed compared BF0. Organic more accumulated 0.053–0.25 aggregates BF-amended soils. Bio-fertilizer combined had stronger effects on stability content years comparison control treatments alone. This study provided insights into appropriate bio-fertilizer; better for increasing soil improving given soil.