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410 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGYAcknowledgments: This research was funded by a Research collaboration project on the application of science and technology between the Vietnam Academy of Science and Technology and the People%u2019s Committee of Quang Tri Province %u201cResearch on the improvement of production processes and the use of multifunctional biological products to enhance degraded hilly and poor-quality soils in Quang Tri Province.%u201d Code: UDNDP.05/2022-2023.Conflicts of Interest: The authors declare no conflict of interest.REFERENCES1. Abbott & Murphy, D.V.. Soil Biological Fertility. In Book: A Key to Sustainable Land Use in Agriculture; Managing the Soil Habitat, 2007; pp.203-224.2. Pham, V.T. Research on the experimental production of multispecies, multifunctional biofertilizers for industrial-scale crop application. Final report on the scientific and technological project for experimental production, project code: KC.04.DA11. Ministry of Agriculture and Rural Development, VietNam, 2008.3. Hatfield, J.L.; Walthall, C.L. Soil biological fertility: foundation for the next revolution in agriculture? Commun. Soil Sci. Plant Anal., 2015; Vol. 46, pp. 753%u2013762. 4. Nguyen, T.H. Research on the production of microbial preparations for peanut cultivation in sandy coastal soil of Nghe An and Binh Dinh provinces. National Conference on Crop Science, the 2nd time, Vietnam Academy of Agricultural Sciences,VietNam, 2016; pp. 1124 - 1132. 5. Pham, T.T.H.; Ton, T.H.D.; Pham, V.C.; Tran, T.H.; Tran, T.Y.N. Using microbial preparations and Chitosan biological products to increase yield and control fungal diseases in pepper (Piper