This standard applies to ternary or binary compound fertilizers containing rare earth elements and containing ammonium bicarbonate as the main nitrogen source. This standard specifies the technical requirements and test methods for rare earth elements incorporated into ammonium bicarbonate compound fertilizers.
HG 2842-1997 history
1997HG 2842-1997 Rare earths content and determination in ammonium bicarbonate-compound fertilizers(tentadtive)