Look at the appearance. In addition to ammonia and liquid ammonia, the rest are solid crystals or granular, in the nitrogen fertilizer, in addition to lime nitrogen is black, Other varieties are generally white. Phosphate fertilizers are generally grey or dark gray. In potassium fertilizers, they are generally white.
Smell the smell. Nitrogen fertilizers have special ammonia odor such as ammonia, liquid ammonia, and ammonium bicarbonate. Lime nitrogen has similar calcium carbide odor. Other fertilizer varieties generally have no special odor.
Burning test. Take a few samples placed on a piece of iron, clamped with iron clamps, burn on an alcohol lamp, view the melting of the situation, ammonium chloride and ammonium bicarbonate do not melt directly sublimation and decomposition; ammonium sulfate, ammonium nitrate, urea, nitric acid The sodium melts into a liquid or semi-liquid form; the phosphorus, potash, and lime nitrogen do not melt and remain solid.
Check the solubility. Fully dissolved fertilizer except lime nitrogen, potassium fertilizer and nitrogen fertilizer are all dissolved, and phosphorus fertilizer and lime nitrogen are insoluble or partially dissolved.
How to identify true and false compound fertilizers and color compound fertilizers are mostly red granules, and there are also a few white granules due to the use of white potassium chloride as raw material. Counterfeit compound fertilizers have poor granularity, mostly powdery, with a gray or black color.
Dissolving: Put a few grains of compound fertilizer into the container. Add a small amount of water and stir quickly. The particles will disappear quickly and disappear faster. The quality of the compound fertilizer is better. Counterfeit compound fertilizers have poor solubility and do not dissolve or dissolve a little after being stirred in the water, leaving a large amount of insoluble residue.
The burning test places the compound fertilizer on red-hot charcoal or a burning cigarette tip. The chemical fertilizer immediately melts and foams boiling, with the release of ammonia gas. Counterfeit compound fertilizers do not melt or melt a very small portion.

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