“This is the seed of a new variety that has the highest purity and is produced, developed, controlled, and provided directly by breeders or their institutions for further multiplication.”
References
International Rice Research Institute (IRRI). Rice Knowledge Bank – seed certification. 2017. http://www.knowledgebank.irri.org/training/fact-sheets/postharvest-management/rice-quality-fact-sheet-category/item/seed-certification-fact-sheet