Home / Standards / GB/T 44971-2024 GB/T 44971-2024 Active Soil selenium grade 土壤硒含量等级 Standard Type GBT ICS 13.080.10 CCS B10 Status 现行 Issue Date 2024-11-28 Implementation 2025-03-01 Responsible Dept 农业农村部 Drafting Unit N/A