Overview
Coated urea is a specialized nitrogen fertilizer designed to release nutrients gradually through a physical barrier, typically polymer or sulfur-based. Unlike conventional urea, which dissolves rapidly, coated variants match nutrient supply to plant uptake, minimizing waste and environmental harm. Developed in the mid-20th century, it addresses challenges like nitrogen volatilization and groundwater contamination. Modern coated urea products may include additional layers for UV protection or micronutrient enrichment. The technology is particularly valuable in high-value crops, precision agriculture, and regions with strict environmental regulations.
Physical and Chemical Properties
The core material is standard urea (46% nitrogen), but the coating alters its behavior. Polymer coatings (e.g., polyurethane) create semi-permeable membranes that allow slow water penetration, while sulfur coatings rely on microbial degradation. Release rates depend on coating thickness, temperature, and soil moisture. Coated granules typically exhibit higher crush strength (20–50 N) than uncoated urea, reducing dust formation. The density increases slightly due to the coating layer, affecting spreading characteristics. Solubility is intentionally delayed, with some products releasing 80% of nitrogen over 3–6 months.
Main Applications
In agriculture, coated urea is ideal for crops with long growing seasons (e.g., corn, sugarcane) or high nitrogen demand (e.g., leafy vegetables). It reduces fertilizer application frequency by 30–50% compared to conventional urea, lowering labor costs. Golf courses and sports turfs favor coated urea for even greening without growth spikes. In horticulture, it’s used in container-grown plants and drip irrigation systems. Recent innovations include biodegradable coatings for organic farming compliance.
Safety and Storage
While coated urea is generally safe, broken coatings may release urea dust, requiring PPE during handling. Storage must prevent coating damage—avoid stacking bags over 2 meters high and protect from rodents that may gnaw coatings. Environmental risks are mitigated but not eliminated. Overapplication can still cause soil acidification. Unlike quick-release urea, it poses lower risks of foliar burn, making it suitable for top-dressing applications.
B2B Procurement Guide
Buyers should specify: 1) Coating type (polymer, sulfur, hybrid), 2) Release curve (linear/quadratic), 3) Coating percentage (typically 3–15% by weight), and 4) Certifications (e.g., ISO, EPA). Bulk shipments require moisture-proof containers. Regional climate affects performance—thicker coatings suit tropical climates. Compare cost per unit of effective nitrogen (not per ton) for ROI calculations. Leading manufacturers include Haifa Group, Koch Agronomic Services, and Kingenta.
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