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408 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGYharzianum N4.1 and Nitrosomonas winogradski NBRC 14297, have played a significant role. These microbial activities have led to a rise in organic carbon (OC) content in the peanut cultivation soil to 6.89%, up from 2.78% before treatment. Additionally, total nitrogen content increased from 0.11% to 0.32%. These findings align with previous studies on the potential of microbial organic fertilizers as alternatives to chemical fertilizers, as reported by Ken E. Giller et al. (1998), Nguyen Van Vien et al. (2012), and Nguyen Thu Ha et al. (2016) [4,11,12].Additionally, the biological products in this study contain Bacillus subtilis TiN1 and Penicillium oxalicum N19CL, which have phosphate-solubilizing activity. When applied in model 2, they increased the P2O5 content from 197.52 mg/100g has increased 439.53 mg/100g. Many types of microorganisms have been shown to play a crucial role in the biogeochemical cycling of both inorganic and organic phosphorus in the soil around plant roots. Therefore, the rapid commercial development of phosphatesolubilizing microbial products is anticipated in the future, as previously reported by Parnell et al. (2016), Rafi et al. (2019), and Hui-Ping et al. (2023) [13-15].The growth correlation between the stem, leaves, and root system in plants has been defined by botanists as a stimulatory relationship. Studies have shown that if the stem and leaves grow well, it will lead to better root growth and higher yields, and vice versa [16]. The results of this study indicate that the model utilizing multifunctional biological products for soil improvement, when supplemented with beneficial microbial strains, has led to increased height of peanut plants, a higher number of effective flowers, an increased total number of pods per plant, a greater number of sound pods, and an enhanced weight of 100 pods, ultimately resulting in a 22% increase in yield.