Urea尿素
Urea (CO(NH₂)₂) is the most concentrated common solid nitrogen fertilizer, with agricultural-grade material containing not less than 45% total nitrogen. GB/T 2440-2017 classifies it into two grades: premium and qualified.
Key points
- Agricultural premium grade: total nitrogen ≥46.0%, biuret ≤0.9%, moisture ≤0.5%. Qualified grade: total nitrogen ≥45.0%, biuret ≤1.5%, moisture ≤1.0%.
- Urea is amide nitrogen and must be hydrolysed by soil urease to ammonium before substantial uptake, so heavy irrigation immediately after application is inadvisable.
- Urea is also the feedstock for automotive urea (diesel exhaust after-treatment) and for industrial urea-formaldehyde resins, so its demand base is not purely agricultural.
- Urea is listed among the products exempt from registration under China's fertilizer registration rules.
Related terms
Nitrogen Fertilizer
A nitrogen fertilizer is one whose primary function is to supply nitroge…
Biuret
Biuret is an impurity formed when two molecules of urea condense at elev…
Urease Inhibitor
A urease inhibitor is a compound, such as NBPT, that suppresses soil ure…
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- Category：Straight fertilizers
- Definition basis：GB/T 2440-2017 Urea
Updated：Oct 16, 2026