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ASSESSMENT OF THE SOIL IMPROVEMENT ABILITY OF MULTIFUNCTIONAL BIOLOGICAL PRODUCTS ON POOR SOIL USED FOR PEANUTS (ARACHIS HYPOGAEA L.) IN QUANG TRI PROVINCEPham Thi Thuy Hoai1*, Nguyen Thi Thu Thuy2, Tran Thi Hong1, Nguyen Thi Ngoc Anh3Abstract: Peanuts have emerged as a vital crop in Quang Tri province, serving as a primary income source for numerous farmers. Combining organic fertilizers and agricultural byproducts with beneficial microbial preparations enhances soil quality and improves agricultural efficiency. Applying 5 kg/ha of a multifunctional biological soil conditioner in the fertilization and care process for peanuts in Quang Tri province raises soil acidity (pHKCl) from 3.97 to 4.67. Organic carbon content (OC%) increases from 2.78% to 6.89%, while the concentrations of readily available phosphorus and potassium rise from 197.52 mg/100 g and 206.68 mg/100g to 439.53 mg/100 g and 511.60 mg/100 g, respectively. Calcium content increases from 7.73 Idl/100 g to 8.76 Idl/100 g, and magnesium content rises from 1.55 Idl/100 g to 1 Mientrung Institute for Scientific Research - Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), ptthoai@misr.vast.vn, tthong@vnmn.vast.vn2 University of Agriculture and Forestry, Hue University, nguyenthithuthuy@huaf.edu.vn 3 Hanoi Open University, Hanoi, Vietnam, ngocanhcnsh@hou.edu.vn* Correspondence: ptthoai@misr.vast.vn, phamtthoai@gmail.com