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402 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGYFigures 3. The effect of multifunctional biological products for soil improvement on the readily available P2O5 and K2O content for peanuts in 2024, Quang Tri(Analysis results at the Quang Tri Center for Standards, Metrology, and Quality Control)Table 2. The effect of multifunctional biological products for soil improvement on the chemical properties of the soil and microbial density in the soil in 2024, Quang Tri provinceModels pHKCl Ca++ ldl/100g Mg++ ldl/100g Beneficial microbial densityDAT TXL 3.97 7.73 1.55 1.92x106LMH1 4.57 8.03 1.84 6.86x106LMH2 4.67 8.76 2.42 7.24x107Models Nitrogen-fixing microbial densityPhosphatesolubilizing microbial densityCellulosedecomposing microbial density DAT TXLLMH1LMH22.64x105 4.48x105 3.55x1051.45x106 2.04x106 1.71x1061.75x107 2.81x106 7.3x106 (Analysis results at the Quang Tri Center for Standards, Metrology, and Quality Control)