Original ResearchPublished 8 October 2026Long-term organic fertilization enhances paddy soil nitrogen availability through direct nutrient stimulation and complementary diazotroph-mediated pathwayLi Wen · Chao Li · Kaikai Cheng · Lihong Shi · Lingling Liu · Shijie Qin · Ke Wang · Peng Jiang · Haiming TangFrontiers in Microbiologydoi 10.3389/fmicb.2026.1923757