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RESEARCH ON THE APPLICATION OF ORGANIC MICROBIAL FERTILIZERS FOR SOME VEGETABLE CROPS GROWN ON THE SANDY SOIL OF THE TRUONG SA ARCHIPELAGOXuyen Duong1, Thanh Luong2, Nga Vu2, Anh Dam2, Quynh Nguyen2, Minh Nguyen3, Van Dao4, Tam Nguyen5,*Abstract: The article investigates the enhancement of vegetable and tomato yields cultivated on the sea sandy soil of Truong Sa using organic microbial fertilizer derived from agricultural straw byproducts. Research findings indicate that the organic microbial fertilizer produced from straw adheres to the quality standards outlined in the current regulations for organic fertilizer quality, QCVN 01-189:2019/BNNPTNT. When combining organic fertilizer with microbial preparations at a 1 Ministry of Natural Resources and Environment, 10 Ton That Thuyet, Ha Noi, Viet Nam, email: dttxuyen@monre.gov.vn2 Institute of Environmental Agriculture, Sa Doi, Me Tri, Nam Tu liem, Ha Noi, Vietnam, huuthanhvasi@gmail,com, ngavuthuy71@gmail.com, damtronganh@gmail.com, nguyenngocquynh1412@gmail.com3 Institute of Military Environmental Chemistry, Ministry of Defense, An Khanh, Hoai Duc, Ha Noi, Viet Nam, nguyenminh_ctet@yahoo.com.vn4 Hanoi Open University, B101 Nguyen Hien, Bach Khoa, Hai Ba Trung, Ha Noi, Viet Nam, hongvancnsh@hou.edu.vn5 Faculty of Environmental Sciences, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi, Viet Nam, tamnkb@hus.edu.vn* Correspondence: tamnkb@hus.edu.vn