1. Appearance identification: It can be identified from the physical properties such as the shape, color and smell of the fertilizer, such as urea in white pearl-like particles, carbonic acid in white crystals with pungent smell, and gray powdery or granular calcium superphosphate.
2. Identification of adding water: Take half a glass of water, take a spoonful of chemical fertilizer, slowly add it to the water, stir and let it stand for a while. If nitrogen fertilizer or potassium fertilizer is completely soluble, the insoluble or partially soluble fertilizer is phosphate fertilizer. After the soluble fertilizer is ground with lime, it is ammonia nitrogen fertilizer that smells ammonia odor.
3, combustion identification: take a shovel, heat it on the fire, then take out a small amount of fertilizer that needs to be identified, pour it on the shovel and observe that it smells of ammonia, and ammonium nitrate is the flame; It is potassium sulfide that hisses and has a purple flame, ammonium chloride that emits thick white smoke and smells of ammonia and hydrochloric acid, urea that turns into water after smoking, ammonium bicarbonate that only melts without smoking and ignition, calcium superphosphate that remains unchanged during combustion, and phosphate rock powder that fluoresces.