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Identification of fertilizers
Packaging identification method 1, check mark: The relevant state department regulations, fertilizer packaging bags must indicate: product name, nutrient content, grade, trademark, net weight, standard code, factory name, site, production license number mark. If the above signs or signs are not complete, it may be counterfeit or inferior fertilizer. 2. Check the sealing of the bag: Special attention should be paid to the chemical fertilizer with obvious sealing and unsealing marks. This phenomenon may be adulterated. The urea of ​​the shape and color identification method is white or pale yellow and is in the form of granular, acicular or prismatic crystals, without powder or with few powders. Ammonium sulfate: white crystals. Ammonium chloride: white or light yellow crystals. Ammonium bicarbonate: White or other colored powder or granular crystals, but also some manufacturers produce large particles of flat spherical ammonium bicarbonate. Superphosphate: Off-white or light gray powder. Heavy calcium phosphate: dark grey, off-white particles or powder. Potassium sulfate: White crystals or powder. Potassium chloride: white or light red particles. Odor identification method If the liquid with strong pungent ammonia smell is ammonia, it is ammonium bicarbonate with obvious pungent ammonia smell, and the fine powder with sour taste is heavy calcium phosphate. If superphosphate has a very pungent, sour taste, it is likely that spent sulphuric acid is used in the production process. This fertilizer is very toxic and can easily damage or burn crops, especially in rice ponds. What needs to be reminded is that although some chemical fertilizers are true, their content is very low, such as inferior superphosphate, and the effective phosphorus content is less than 8% (the minimum standard should reach 12%). These chemical fertilizers are poor quality chemical fertilizers and have little effect on fertilizers. Professionals should be identified when purchasing them. China Agricultural Network Editor