I. Nitrogen Fertilizer There are two cases of counterfeit urea appearing on the market: one is the mixing of urea and ammonium bicarbonate, that is, the fertilizer bag is filled with urea, and the following is ammonium bicarbonate. It is characterized by good flow properties above, no flow underneath, even agglomeration, and smell of pungent ammonia. The urea in this case can be judged to be pseudo urea mixed with ammonium hydrogencarbonate. The second is the mixing of urea and ammonia. Both fertilizers are white, odorless, fluid, and granulated with white smoke. The difference is that the urea particles are large, translucent, loose, non-reflective and moist, and are rapidly melted on the red-hot charcoal or iron plate, and the ammonia gas with pungent and smoky eyes is released. The ammonium nitrate particles are small, the surface is bright, and there is obvious reflection and dampness. On the red charcoal or iron plate, intense burning occurs, and strong light is emitted to produce a "sting" sound. If this is the case, it can be judged that ammonium nitrate is mixed in the urea.
Second, phosphate fertilizer The market for counterfeit superphosphate is mainly phosphorus gypsum, waste cement slag and so on. The identification method is as follows: 1) Appearance. The superphosphate is a dark gray or off-white, light gray loose powder with a sour taste. Phosphogypsum is an off-white hexagonal granular crystal or crystalline powder with no acidity. Calcium, magnesium and phosphate fertilizers are sour-free and are very dry, vitreous or fine. The waste cement residue is gray powdery, dull, non-sour and has more hard particles. 2) feel. Superphosphate is heavy and feels but not frivolous. Phosphogypsum has a light texture and feels dry and dry. The waste cement slag is heavier than super-calcium phosphate, and the hand feel is not greasy, does not swell, does not dry, and has hard cement particles. 3) Water solubility. Part of the superphosphate is dissolved in water, and the phosphogypsum and calcium magnesium phosphate are insoluble in water, and the waste cement slag is added with water to form a slurry and re-solidified. In the identification, if it is found that there are obvious impurities such as clods, stones and cinder in the superphosphate, it is inferior superphosphate. If the acidity is too rich and the water is too much, it is unqualified. Unfinished superphosphate,
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