This standard applies to Ziyang selenium-rich tea production areas
DB61/T 307.2-2013 history
2021DB61/T 307.1-2021 Environmental Conditions of Production Areas of Ziyang Selenium-enriched Tea
2013DB61/T 307.2-2013 Environmental Conditions of Ziyang Selenium-enriched Tea
0000 DB61/T 307.2-2003
DB61/T 307.2-2013 Environmental Conditions of Ziyang Selenium-enriched Tea was changed to DB61/T 307.1-2021 Environmental Conditions of Production Areas of Ziyang Selenium-enriched Tea.