Double Superphosphate Granules (DSP)
Double superphosphate (DSP) provides 40-46% P2O5 through a two-stage phosphoric acid process on phosphate rock, free of calcium sulfate unlike SSP. Classified under HTS 3103.19.00.00 as other superphosphates for high-analysis field application in row crops and vegetables. Its low sulfur content makes it ideal for sulfur-sensitive soils.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If phosphatic fertilizers not qualifying as superphosphates
Other mineral/chemical phosphatics like soft rock phosphate or partially acidulated products fall outside superphosphate definitions.
If for retail sale in diammonium phosphate form
DAP retail packaging shifts to 3105; bulk DAP might qualify under 3103 if meeting superphosphate criteria.
If unprocessed natural phosphates
Raw phosphate rock before calcining or acid treatment remains in Chapter 25, not Chapter 31 fertilizers.
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Import Tips & Compliance
• Document production process proving no sulfuric acid use to distinguish from SSP under 3103.10; request advance ruling for blends
• Ensure granules meet uniform size specs (2-4mm) to avoid reclassification as powder under different duties
Related Products under HTS 3103.19.00.00
Triple Superphosphate Fertilizer (TSP)
Triple superphosphate (TSP) is a highly concentrated phosphatic fertilizer containing 44-48% P2O5, produced by reacting phosphate rock with phosphoric acid. It falls under HTS 3103.19.00.00 as 'other superphosphates' distinct from single superphosphate, used primarily for crops needing high phosphorus like grains and fruits. This granular product dissolves readily in soil to promote root development.
Granular Triple Superphosphate 46% P2O5
This premium granular TSP delivers 46% available phosphoric acid (P2O5) in 2-4mm prills for uniform soil distribution via broadcast or side-dress. HTS 3103.19.00.00 covers this as other superphosphate for intensive farming of corn, soybeans and cotton. Water-soluble phosphorus boosts early root growth without nitrogen.
Water-Soluble Triple Superphosphate Powder
Fine-ground TSP powder (95% through 100 mesh) with 44% P2O5 for fertigation systems and foliar applications in greenhouses. Falls under HTS 3103.19.00.00 as other superphosphates, ideal for hydroponics and drip irrigation of tomatoes and peppers. Rapid dissolution prevents clogging emitters.
High-Grade Double Superphosphate 42%
DSP 42% P2O5 in dense granules resists crushing during pneumatic application, suitable for aviation-spread over large pastures. HTS 3103.19.00.00 'other superphosphates' for phosphorus-deficient grasslands and hayfields. Minimal free phosphoric acid reduces equipment corrosion.
Enriched Triple Superphosphate with Micronutrients
TSP fortified with 0.5% zinc and boron meets Chapter 31 note limits for inorganic nonfertilizing additives, retaining superphosphate status. HTS 3103.19.00.00 for corrected deficiency in calcareous soils growing wheat and rice. Granules ensure uniform micronutrient delivery.