Simple identification method of commonly used chemical fertilizers

There are many kinds of chemical fertilizers. After storage for a certain period of time, the labels on the packaging will become unclear or even unrecognizable. This will cause inconvenience to use. Here you will introduce simple identification methods for several commonly used chemical fertilizers.
1. Appearance identification: nitrogen fertilizer is slightly lighter than lime, but other uniform white crystals, potassium is white crystals, but Canadian potash is reddish-brown. Phosphate fertilizers are generally powdery, mostly gray or gray.
2. Solubility identification method: general nitrogen and potassium fertilizers are soluble in water, and phosphate fertilizer is only partially soluble in water or insoluble in water, of which superphosphate is partially soluble in water and has a sour taste, while calcium, magnesium phosphate fertilizer and phosphate rock powder are insoluble in water.
3. React with alkaline: Take a little fertilizer and the same amount of raw, hydrated lime mixed together, increase grinding, can smell the pungent ammonia smell, it is nitrogenous nitrogen fertilizer or compound fertilizer. Otherwise it is ammonia-free fertilizer.
4. Combustion method: The material will be placed on a piece of iron plate and burned on the fire to observe: a lot of white smoke, ammonia smell, no residue, is ammonium hydrogen phosphate; does not melt, direct sublimation or decomposition, there is chlorine for sour taste Ammonium; Soluble into liquid or semi-liquid, a large number of white burning, ammonia smell and pungent sulfur dioxide, residue yellow bubble, ammonium sulfate, no significant changes in fertilizer burning, but there is crackling, dry Blasting beating and spreading in the fire, the flame is purple as potassium fertilizer, in which the beat is intense and the water dissolves slowly is potassium sulphate, conversely it is potassium chloride, and the role of combustion aid in burning red charcoal is potassium nitrate.

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