In order to enable farmers to choose fertilizers correctly, Pingyin Consumers Association Ancheng Branch reminds farmers to use the following methods to identify fertilizers when they purchase fertilizers, so as not to be deceived and cause unnecessary losses. First, visual identification: the fertilizer produced by regular manufacturers, its packaging specifications, strong, with production license, implementation standards, registration license, trademark, product name, nutrient content (grade), net weight, plant name, site, etc.; The packaging of counterfeit and inferior fertilizers is generally rough, the information on the packaging bags is unclear, the quality is poor, and it is easy to break. Nitrogen fertilizer (except lime nitrogen) and potassium fertilizer are mostly crystalline, and phosphate fertilizer is mostly agglomerate or powdery amorphous. The high-quality compound fertilizer granules and the specific gravity are relatively uniform, the surface is smooth, and it is not easy to absorb moisture and agglomerate; while the fake and inferior fertilizers are just the opposite, the fertilizer particles are uneven in size, rough, high in humidity and easy to agglomerate. Nitrogen fertilizer is almost all white except lime nitrogen, some slightly yellowish brown or light blue (except for adding other ingredients); potassium fertilizer is white or slightly red, such as potassium dihydrogen phosphate is white; phosphate is mostly dark gray. Second, touch recognition: put the fertilizer in the palm of your hand, hold it hard or press it, and judge the fertilizer according to the hand feeling. Using this method, it is more effective to discriminate the diammonium in the United States. Grab a handful of fertilizer and hold it several times. The "oily" feeling is genuine, while the dry one is likely to be impersonated with compound fertilizer. Third, the sense of smell: by the special smell of fertilizer to make a simple judgment. For example, ammonium bicarbonate has a strong ammonia odor; ammonium sulfate is slightly sour; superphosphate has a sour taste. The fake and inferior fertilizers are not obvious. 4. Combustion recognition: The fertilizer sample is heated or burned, and the fertilizer is identified from the color of the flame, the melting condition, the smell of the smoke, and the residue. Ammonium bicarbonate and ammonium chloride directly decompose, a large amount of white smoke occurs, strong ammonia smell, no residue; urea, can melt quickly, emit white smoke, can be burned in charcoal fire, or take a glass piece to contact white smoke At the time, it can be seen that a layer of white crystals is attached to the glass piece; the superphosphate, calcium magnesium phosphate, phosphate rock powder and the like have no change on the charcoal; potassium sulfate, potassium chloride, potassium magnesium sulfate and the like have no change on the red charcoal, only It made a loud noise. The combustion of compound fertilizer is closely related to its constituent materials. When there is ammonia nitrogen or amido nitrogen in the raw material, it will emit strong ammonia smell and a large amount of residue.
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