4.1 Basic requirements The quality requirements of rice should comply with GB/T1354. 4.2 Zinc content requirements The high-zinc rice specified in this document has a zinc content of 25mg/kg. Zinc content requirements are not graded. 4.3 Safety requirements 4.3.1 shall be implemented in accordance with GB2715, GB2762, GB2763 and relevant national regulations. 4.3.2 Plant quarantine shall be implemented in accordance with relevant national regulations.