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430 PROCEEDINGS OF INTERNATIONAL SCIENTIFIC CONFERENCE ON APPLIED BIOTECHNOLOGY15. Ministry of Agriculture and Rural Development, 2019. National Technical Regulation QCVN 01-189:2019/MARD - Fertilizer Quality.16. Ministry of Science, Technology and Environment, 1996. Vietnamese Standard TCVN 6167:1996 on microbial fertilizers for the decomposition of insoluble phosphorus compounds. 17. Ministry of Science and Technology, 2002. Vietnamese Standard TCVN 6168:2002 on microbial preparations for cellulose decomposition. 18. Ministry of Science and Technology, 2016. National Standard TCVN 11403:2016 on Fertilizers - Determination of total arsenic content by atomic absorption spectrometry.19. Ministry of Science and Technology, 2018. National Standard TCVN 9290:2018 on Fertilizers - Determination of Total Lead Content by Flame Atomic Absorption Spectrometry and Electrothermal (Flameless) Method.20. Ministry of Science and Technology, 2015. National Standard TCVN 10676:2015 on Fertilizers - Determination of Total Mercury Content by Atomic Absorption Spectrometry - Cold Vapor Technique. 21. National Standard TCVN 9291:2018 Fertilizers - Determination of Cadmium Content.22. National Standard TCVN 6846:2007 (ISO 7251:2005) on Microorganisms in Food and Feed - Method for Detection and Enumeration of Presumptive Escherichia coli - Most Probable Number Technique.23. Ministry of Science and Technology, 2017. National Standard TCVN 10780-1:2017 (ISO 6579-1:2017) on Microorganisms in the food chain - Methods for detection, enumeration and