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400 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGY3. RESULTS3.1. The impact of multifunctional biological products on soil chemical properties and microbial density in peanut cultivation on poor soil in Quang Tri ProvinceThe results of analyzing some chemical indicators in the soil before and after applying biological products to improve the soil are shown in Table 2, Figures 2 and 3. The acidity level of the soil (pHKCl) had small changes, the pH increased slightly after applying biological products to improve the soil. In the control model, the pH was 4.57, while in the model with the biological preparation, it increased to 4.67. Organic carbon content (OC%) significantly increased in model 2, reaching 6.89%, compared to 5.20% in model 1. Total nitrogen, phosphorus, and potassium (N%, P2O5, K2O) were also increased in both models. Before applying biological products, the content of easily available P2O5 was 197.52 mg/100 g and the content of easily available K2O was 206.68 mg/100 g. After application, in model 2, the content of easily available P2O5 increased to 439.53 mg/100 g and the content of easily available K2O was 511.60 mg/100 g. Meanwhile, in model 1, these values were 377.54 mg/100 g and 496.67 mg/100 g, respectively, lower than in model 2. The content of Ca++ and Mg++ cations both increased in the two models after applying organic fertilizer and biological products to improve the soil. Before applying biological products to improve the soil, the Ca++ content was 7.73 Idl/100 g, increased to 8.03 Idl/100 g in model 1 and increased even more in model 2 to 8.76 Idl/100 g. The Mg++ content increased in model 1 to 1.84 Idl/100 g and in model 2 to 2.42 Idl/100 g. While the Mg++content before applying biological products was from 1.55 Idl/100 g before treatment. Microbial density, including nitrogen-fixing bacteria, phosphate-solubilizing microorganisms, and cellulosedecomposing microbes, was higher after the application of