Akok Dış Ticaret - Global Bulk Commodity and Fertilizer Supply
AKOK DIŞ TİCARET // 2008
Urea 46% Nitrogen 2 min technical read SEO Score: 98/100

Prilled Urea vs Granular Urea: Agricultural Volatilization & Dissolution Rate Comparisons

STANDARDS: ASTM D4239 • ISO 5315 • SGS Draft Survey • UCP 600
Autonomous Verification: 2026-11-04
Executive Summary & Key Takeaways

Comparing prilled urea vs granular urea 46% nitrogen (CAS 57-13-6, HS Code 3102.10) reveals distinct agronomic profiles: spherical prills (1.0-2.8 mm) dissolve 35% faster for drip fertigation and foliar sprays, whereas larger conditioned granules (2.0-4.75 mm) enable 36-meter broadacre spreading and lower ammonia volatilization losses by 14% to 22%.

Overview and Global Trade Significance of Prilled Urea Vs Granular

In high-volume B2B bulk commodity markets, procuring certified prilled urea vs granular requires rigorous oversight of chemical purity, cargo friability, and port loading efficiency. Akok Global Trading manages complete supply chains linking certified production refineries with global discharge terminals.

Core Chemical & Technical Specifications

  • Guaranteed Quality: Min 46.0% N
  • Primary Industrial Application: Field agronomy and fertigation systems
  • Verified Independent Inspection: SGS, Intertek, or Saybolt at loading port
  • Customs Tariff Classification: HS Code 3102.10

Bulk Marine Logistics and Incoterms Execution

Ocean fixtures are executed under standard Gencon charter parties for Handysize and Supramax bulk carriers. Strict adherence to Notice of Readiness (NOR) and Statement of Facts (SOF) ensures continuous loading rates of 3,000 to 5,000 MT PWWD SHINC, actively preventing demurrage exposure.

Frequently Asked Questions (FAQ)

What is the standard minimum order quantity (MOQ)?

For ocean-going bulk vessel parcels, the minimum contract volume is 5,000 MT. For containerized cargo packed in 1.0 MT jumbo bags, MOQ is 500 MT.

How is cargo quality verified prior to payment release?

Independent inspection agencies (SGS or Saybolt) perform draft surveys and continuous composite sampling to issue official Certificates of Quality and Weight required under Letter of Credit (L/C) terms.

Technical Specifications Comparison

Agronomic & Physical Metric Prilled Urea 46% N (Standard) Granular Urea 46% N (Conditioned) NBPT-Stabilized Granular Urea Reference Standard / Method
Particle Granulometry (90%+ Mass) 1.00 - 2.80 mm (SGN 170 - 210) 2.00 - 4.75 mm (SGN 280 - 320) 2.00 - 4.75 mm (SGN 290 - 320) ISO 8397 / ASTM E11 Sieve
Specific Surface Area 4.8 - 5.6 cm2 per gram 2.4 - 3.1 cm2 per gram 2.4 - 3.0 cm2 per gram Geometric Laser Diffraction
Aqueous Dissolution Time (20 deg C) 45 - 75 seconds (10% w/v) 110 - 165 seconds (10% w/v) 115 - 170 seconds (10% w/v) CIPAC MT 179 Stirred Tank
Unincorporated NH3 Volatilization (14d) 22% - 34% of applied N lost 15% - 24% of applied N lost 4% - 8% of applied N lost Chamber Acid-Trap Volatilization
NBPT Urease Inhibitor Dosage Untreated (0 ppm) Untreated (0 ppm) 450 - 900 ppm active NBPT AOAC / HPLC Assay
Centrifugal Spreader Bout Width 15 - 21 meters (CV < 15%) 32 - 42 meters (CV < 10%) 32 - 42 meters (CV < 10%) ISO 5690-2 Field Pattern Test
Endothermic Solution Cooling -57.8 cal/g (-241.8 J/g) -57.8 cal/g (-241.8 J/g) -57.8 cal/g (-241.8 J/g) Calorimetric Enthalpy

Frequently Asked Questions

Why does prilled urea dissolve faster than granular urea in fertigation tanks?

Prilled urea has a smaller median diameter (1.7 mm vs 3.1 mm) and internal micro-porosity formed during prill tower solidification. This provides nearly double the specific surface area per gram (5.2 cm2/g vs 2.7 cm2/g), accelerating water penetration despite identical endothermic enthalpy of solution.

How does NBPT urease inhibitor reduce ammonia volatilization in surface-applied urea?

N-(n-butyl) thiophosphoric triamide (NBPT) converts in soil into its oxon analog (NBPTO), which blocks the nickel-containing active site of extracellular jack-bean and microbial urease enzymes for 7 to 14 days, allowing rainfall or irrigation to move urea 5 cm deep before hydrolysis.

Why can granular urea be spread twice as wide as prilled urea on centrifugal spreaders?

According to ballistic drag physics, a 3.2 mm granule possesses roughly 6.5 times the mass and momentum of a 1.7 mm prill. This higher terminal velocity overcomes air resistance, projecting granules evenly across 36 to 42 meters compared to 18 meters for lightweight prills.

Which grade is preferred for NPK bulk blending with DAP and MOP?

Granular urea (2.0-4.75 mm, SGN 300) is mandatory for dry NPK bulk blending because its particle size matches granular DAP and MOP. Blending fine 1.0-2.8 mm prills causes severe cone segregation during handling and uneven field nutrient distribution.