Effect of Biochar on Soil Physiochemical Properties and Bacterial Diversity in Dry Direct-Seeded Rice Paddy Fields

The effects of biochar application on dry direct-seeded rice paddies remains unclear. Therefore, we applied to paddy fields over 3 consecutive years assess its soil physicochemical properties and bacterial diversity (conventional fertilization [CK]; + conventional [BC]). BC increased the content 0.25–5 mm water-stable aggregate particles, but decreased that <0.25 aggregates. At different depths, significantly reduced sand silt content. Compared CK, available phosphorus potassium 0–10 10–20 cm layers. There were no significant differences in pH, organic matter, total nitrogen, phosphorus, or between treatments at depths. neutral phosphatase catalase activities. Furthermore, richness, had effect diversity. According Qualcomm sequencing analysis, relative abundance Verrucomicrobia, Chloroflexi, Bacteroidetes, Nitrospirae, Verrucomicrobiae, Blastocatellia_Subgroup_4, Anaerolineae compared CK. genera stronger interrelationships than those redundancy matter was main environmental factor influencing community structure. Overall, could promote nutrient conversion paddies, improve effective content, change composition communities, increase richness. Applying cultivation help realize low-carbon agriculture.