1. Ammonium sulphate or ammonium nitrate impersonating urea: Put the fertilizer on the palm of your hand and add a small amount of ash to harden. If you can smell the ammonia, it is proved to be ammonium sulfate or ammonium nitrate; otherwise, it is urea. 2. Potassium sulfate posing as ammonium nitrate or urea: The fertilizer is placed on a charcoal or iron plate that burns red. If the fertilizer is melted and emits white smoke with ammonia smell, it is proved to be ammonium nitrate or urea, of which nitric acid can be burned. Ammonium, urea can not burn; if the fertilizer does not have any changes and odors, but can hear the crackling sound, it turns out to be potassium sulfate. In addition, ammonium nitrate and urea are granular crystals, and potassium sulfate is a powdery crystal. When the volume is the same, potassium sulfate is much heavier than ammonium nitrate and urea. 3. "Three things" posing as "diammonium": "three things" that is three materials superphosphate, also known as heavy superphosphate, referred to as heavy calcium, only a gray color, large and uniform particles, hand rubbing When there is no ammonia, and diammonium phosphate (the people referred to as "diammonium") are yellow ash, iron gray and other colors, the particle size is not uniform, there is a clear ammonia odor when hand rubbing. (Source: China Agricultural Information)
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