First, nitrogen fertilizer. There are two cases of counterfeit urea appearing on the market:
1. Urea and ammonium carbonate are mixed. The fertilizer bag is filled with urea and carbon ammonium underneath. It is characterized in that the above urea has good hand flow or push flow performance, the bottom does not flow, even agglomerates, and can smell a pungent ammonia smell.
2. Urea and ammonium nitrate. The urea granules are large, translucent, loose, non-reflective and moist, while the ammonium nitrate particles are small, the surface is bright, and there is obvious luminescence and moisture.
Second, phosphate fertilizer. Counterfeit superphosphate on the market mainly includes phosphogypsum, waste cement residue, etc. The identification method is:
1. Appearance: Calcium superphosphate is dark gray or white gray, light gray and loose granular, with sour taste; Phosphogypsum is grayish white hexagonal granular crystal or crystalline powder, without acidity; waste cement residue is gray powder granular, dull, It has no acid taste and has more hard particles.
2, feel: super-calcium phosphate is heavy, feels cotton but not frivolous; phosphogypsum texture is light, feels cotton, non-dry waste cement slag texture is more heavy than superphosphate, feel not greasy, not cotton, not dry There is hard cement residue present.
3. Water soluble. The superphosphate is partially soluble in water. In the identification, if there are obvious impurities such as clods, stones and coal particles in the superphosphate, it is inferior superphosphate. If the acidity is too thick and the water is too much, it is unqualified. Calcium phosphate.
1. Urea and ammonium carbonate are mixed. The fertilizer bag is filled with urea and carbon ammonium underneath. It is characterized in that the above urea has good hand flow or push flow performance, the bottom does not flow, even agglomerates, and can smell a pungent ammonia smell.
2. Urea and ammonium nitrate. The urea granules are large, translucent, loose, non-reflective and moist, while the ammonium nitrate particles are small, the surface is bright, and there is obvious luminescence and moisture.
Second, phosphate fertilizer. Counterfeit superphosphate on the market mainly includes phosphogypsum, waste cement residue, etc. The identification method is:
1. Appearance: Calcium superphosphate is dark gray or white gray, light gray and loose granular, with sour taste; Phosphogypsum is grayish white hexagonal granular crystal or crystalline powder, without acidity; waste cement residue is gray powder granular, dull, It has no acid taste and has more hard particles.
2, feel: super-calcium phosphate is heavy, feels cotton but not frivolous; phosphogypsum texture is light, feels cotton, non-dry waste cement slag texture is more heavy than superphosphate, feel not greasy, not cotton, not dry There is hard cement residue present.
3. Water soluble. The superphosphate is partially soluble in water. In the identification, if there are obvious impurities such as clods, stones and coal particles in the superphosphate, it is inferior superphosphate. If the acidity is too thick and the water is too much, it is unqualified. Calcium phosphate.
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