Nitrates, Not Elsewhere Specified or Included

Covering nitrate salts not assigned to dedicated headings, this group includes bismuth nitrates (2834290500), calcium nitrates (2834291000), strontium nitrates (2834292000), and residual nitrates across two additional lines. Calcium nitrate is widely traded as a fertilizer and concrete additive, while strontium nitrate serves pyrotechnic and specialty chemical markets. Norway leads US import supply — consistent with its large calcium nitrate fertilizer production capacity — with Spain and China also among the top sources. Correct identification of the specific nitrate salt is essential, as the five 10-digit lines carry distinct classification and potential trade-remedy implications.