Home / Standards / GB/T 45891-2025 GB/T 45891-2025 Active Fertilizers and soil conditioners—Determination of humic and hydrophobic fulvic acids concentrations in fertilizer materials 肥料和土壤调理剂 肥料原料中腐植酸和疏水性黄腐酸含量的测定 Standard Type GBT ICS 65.080 CCS G20 Status 现行 Issue Date 2025-06-30 Implementation 2026-01-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A