3105.90.00.10 - Potassium nitrate-sodium nitrate mixtures

This HTS category, 3105.90.00.10, specifically covers mixtures of potassium nitrate and sodium nitrate when presented as fertilizers. These substances provide essential nitrogen and potassium nutrients for plant growth. The classification hinges on the presence of both potassium nitrate and sodium nitrate as key components in the mixture, distinguishing it from other fertilizer formulations.

Within the broader classification of "Other" fertilizers under HTS code 3105.90, this subcategory is differentiated by its precise chemical composition. While the sibling category 3105.90.00.50, also "Other," encompasses a wider array of fertilizer products not elsewhere specified, this particular heading is dedicated solely to the potassium nitrate-sodium nitrate blend. This ensures distinct treatment for this specific combination of fertilizing elements.

As this is a leaf node, there are no further subdivisions. Therefore, classification under 3105.90.00.10 relies on the affirmative identification of both potassium nitrate and sodium nitrate as the primary constituents of the fertilizer product, intended for agricultural or horticultural use. The gross weight of the packaging is not a determining factor for this specific subcategory, as it falls under the general provision for fertilizers in bulk or large packages, as long as it meets the chemical composition criteria.