Prilled urea is a granular form of urea, typically appearing as small circular or nearly circular particles of 1-4 millimeters in size. It has a pure white or slightly pale yellow appearance, a smooth surface, good flowability, and is easy to transport, store, and apply.Its nitrogen content is about 46%, making it a high nitrogen and quick acting nitrogen fertilizer that is easily soluble in water and has a fast release of fertilizer efficiency. It is widely used as a base fertilizer, topdressing, or foliar spray for various crops in agriculture, and can also be compounded with other fertilizers to form compound fertilizers.However, it is prone to moisture absorption and clumping in high humidity environments. When applying, it is important to avoid direct contact with the seeds to prevent burns.
Physical and chemical properties
Physical properties: Uniform particles, good flowability, not easily clumped (usually with anti caking agents added), easy to transport, store, and mechanically fertilize.
Chemical properties: Easy to dissolve in water, releasing nitrogen after dissolution, fast fertilizer effect, but also prone to loss (such as infiltration with rainwater).
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Advantages:
High nitrogen efficiency: With a nitrogen content of 46%, it belongs to the high nitrogen variety of quick acting nitrogen fertilizers, which can quickly supplement crop nitrogen nutrition and meet the needs of critical growth periods.
Convenient application: The particles are small and uniform, with good fluidity, making it easy to manually or mechanically spread or furrow apply. It is also suitable for mixing with other fertilizers and adaptable to various fertilization methods.
Strong universality: Suitable for various crops and different soils, it can be used as a base fertilizer, topdressing, or compound fertilizer separately, and has a wide range of agricultural applicability.
Industrial adaptability: The particles are small and uniform, making them easy to mix with other raw materials in industrial processing. They are commonly used in the production of chemical products such as urea formaldehyde resin and melamine.
Disadvantages:
Strong moisture absorption: High humidity environments are prone to moisture absorption and agglomeration, affecting storage and application, and require moisture prevention.
Volatile loss: If not deeply applied or covered in soil, nitrogen is prone to volatilization and loss, reducing utilization efficiency and potentially polluting the environment.
Potential fertilizer damage risk: Direct contact with seeds or crop roots, high concentrations of nitrogen may cause burns, and dosage and distance should be controlled.
Low bulk density: Compared to larger particle urea, it has a smaller weight per unit volume and slightly higher transportation costs.
Agriculture
Fertilizer use: As an important source of nitrogen fertilizer, it is directly applied to the soil to provide essential nitrogen elements for crop growth (such as wheat, corn, rice, vegetables, fruit trees, etc.), promote photosynthesis, stem and leaf growth, and increase yield. It can be applied through methods such as spreading, trenching, and hole application, or mixed with other fertilizers to make compound fertilizers.
Topdressing application: Used as topdressing during critical periods of crop growth to quickly supplement nitrogen and alleviate nitrogen deficiency symptoms in crops (such as yellowing of leaves and slow growth).
Foliar spraying: Dissolve it and prepare a solution of a certain concentration for foliar spraying. Through leaf absorption, it quickly supplements nitrogen nutrition for crops, especially suitable for situations where crops urgently need nitrogen supplementation or have weak root absorption capacity.
Industry
Chemical raw materials: used for the production of chemical products such as urea formaldehyde resin and melamine, which are widely used in industries such as plastics, coatings, adhesives, textile auxiliaries, etc.
Feed additive: In animal husbandry, a moderate amount of urea can be used as a feed additive for ruminant animals (such as cattle and sheep). Urea is converted into protein by microorganisms in the rumen, supplementing the animal’s protein needs (the dosage should be strictly controlled to avoid poisoning).
Denitrification treatment: In the treatment of exhaust gas in industries such as power and chemical, it can be used as a reducing agent in selective catalytic reduction (SCR) or selective non catalytic reduction (SNCR) processes to remove nitrogen oxides (NOx) from exhaust gas and reduce air pollution.
