Fertilizer grade urea (small particles)
Urea, also known as carbonamide, is a colorless, odorless, odorless needle or bead crystal. Soluble in water and liquid ammonia. Easy to moisture, when the relative humidity in the air is greater than the moisture absorption point of urea, it absorbs the moisture of the air and deliquescence. When the temperature is higher than 130 ° C, the aqueous solution is directly decomposed into ammonia and carbon dioxide.
Quality Standard: Indicator name
Urea excellent first class qualified
Total nitrogen (N) content (on dry basis),% ≥46.3 46.3 46.0
Biuret content,% ≤0.5 0.9 1.0
Moisture content (H2O),% ≤0.3 0.5 0.7
Iron content (in terms of Fe),% ≤0.0005 0.0005 0.0010
Alkalinity (in terms of NH3),% ≤0.01 0.02 0.03
Sulfate content (in terms of SO 4-2),% ≤0.005 0.010 0.020
Water-insoluble content,% ≤0.005 0.010 0.040
Particle size (φ0.85-2.80mm),%≥90 90 90
Size of the same thing is that their active ingredients are water-soluble quick-acting urea molecules, and nitrogen content is 46%. The only difference is the difference in particle size. Small particles of urea surface area, after application with water and soil contact surface, dissolved and released faster to a little faster. Large particles of urea dissolved in the soil and released a little slower. This difference is reflected in the application of the method, that is when the topdressing, small particles of urea fertilizer to be slightly faster than the effect of large particles of urea fertilizer. And from the point of view of the loss of large particles of urea loss is less than the loss of small particles of urea. In general, the difference between the speed of the two fertilizer is very small. On the other hand, for the absorption and utilization of crops, urea is molecular nitrogen, they are directly absorbed by the crop is not much, in the soil into ammonium nitrogen can be a lot of absorption. So urea regardless of the size of the particles, do top dressing application than ammonium a few days ahead of. In addition, the particle size of large particles of urea and diammonium phosphate particle size is similar, so large particles of urea can be mixed with diammonium phosphate for base fertilizer application, and best not to use large particles of urea to do top dressing.
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