Wandering the agricultural product market, there are many types of agricultural fertilizers. When consumers purchase chemical fertilizers, they should not neglect the identification of fertilizer quality. Here are several commonly used advantages and disadvantages of chemical fertilizer identification method as follows: Packaging identification method 1, check mark: National regulations, the fertilizer packaging bag must indicate the product name, nutrient content, grade, trademark, net weight, standard code, Factory name, site address, and production license number sign. If the above signs are not complete or incomplete, it may be fake chemical fertilizers or inferior chemical fertilizers. 2. Check the sealing of the bag: Special attention should be paid to the chemical fertilizer that has obvious sealing and sealing marks on the bag. This phenomenon may be adulterated. Shape, color identification method 1, urea: white or light yellow, granular, acicular or prismatic crystals, no powder or little powder. 2, ammonium sulfate: white crystals. 3, ammonium chloride: white or light yellow crystals. Ammonium bicarbonate: white or other colored powder or granular crystals. There are also individual manufacturers that produce large particles of spheroidal ammonium bicarbonate. 5, ammonia: a colorless or dark liquid. 6, superphosphate: gray or light gray powder. 7, heavy calcium phosphate: dark gray, gray particles or powder. 8, nitrophosphate: gray particles. 9, potassium sulfate: white crystals or powder. 10, potassium chloride: white or light red particles. 11, ammonium phosphate fertilizer: gray or dark gray granular formulations. Odor identification can also be identified by smelling. The liquid with strong pungent ammonia smell is ammonia water; the particles with obvious pungent ammonia taste are ammonium bicarbonate; the fine powder with sour taste is heavy calcium phosphate. For example, if superphosphate has a very pungent and sour taste, it means that waste sulfuric acid is likely to be used during and after production. This chemical fertilizer is very toxic and can easily damage or burn crops, especially in rice ponds. Add water to dissolve the identification method to take the required chemical fertilizer 1g, put it in a clean glass tube or glass, white porcelain bowl, add 10ml distilled water or clean cold water to shake it completely to see the dissolution: all dissolved is nitrogen fertilizer or potash fertilizer Dissolved in water but residue is superphosphate; soluble in water, without residue or residue is very small; superphosphate; dissolved in water but the ammonia smell is ammonium bicarbonate. It should be reminded 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 should be inferior chemical fertilizers and have no effect on agricultural crops. Big, consumers should ask professionals for identification. China Agricultural Network Editor
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