Abstract:This study conducted field experiments to investigate the impacts of natural humic materials on soil physicochemical properties of continuously cropped ginger, bacterial community composition, and the disease index of ginger bacterial wilt. Three treatments were set up: no application of organic materials (CK), natural humic materials (MT), and organic fertilizer (OF). The results showed that MT significantly altered soil physical structure, compared to CK, the bulk density decreased from 1.35 g/cm3 to 1.16 g/cm3, decreased by 14.1%. Simultaneously, the content of large aggregates (>2 mm) significantly increased by 56.8%, while the content of aggregates (0.25-2 mm) increased by 59.6%. Regarding the expansion of nutrient storage capacity, both MT and OF significantly increased soil organic matter, enhancing nutrient availability. Additionally, MT significantly increased soil pH, and it also increased ginger yield by 155% compared to CK. Disease index had a negative correlation with soil nutrients and water-stable aggregates of 2-0.25 mm. Compared to CK, MT significantly improved the α and β diversity of soil bacterial communities. The changes in bacterial communities were primarily driven by total nitrogen and the content of water-stable aggregates of 0.25-0.053 mm. Furthermore, the bacterial co-occurrence network revealed that natural humus materials could promote the interactions among soil bacteria, enhancing the module diversity and reinforcing the stability of bacterial networks. Interestingly, disease index was mainly directly related to Peribacillus_31373, Gaiella and AG11 bacteria, and natural humus materials inhibited the incidence of bacterial wilt mainly by affecting the bacteria of Peribacillus_31373, Gaiella and AG11. In conclusion, applying natural humus materials could effectively improve soil physical structure and increase soil nutrient reservoir of ginger facility, increase ginger yield, and significantly alleviate the incidence of bacterial wilt mainly by affecting soil nutrient index, water-stable aggregates of 2-0.25 mm and the abundance of important soil bacteria.