Method for quickly identifying commonly used fertilizers
(1) Burning method: The ammonium nitrogen will decompose after being heated. Therefore, a small amount of fertilizer can be placed on the iron piece during the identification and burned on the flame. If a strong irritating odor is produced, and no residue remains, it is a nitrogen fertilizer with high purity; if there are more residues, it means that the nitrogen content is low.
(2) Dissolution method: ammonium nitrogen can be dissolved in water. A small amount of chemical fertilizer can be used, and a small amount of water can be added. If all is dissolved, the nitrogen content is high in purity, and if it is partially or completely insoluble, it contains more impurities.
(3) Adding slaked lime stirring method: mixing and stirring a small amount of chemical fertilizer and slaked lime, and immediately smelling a strong nitrogen fertilizer, indicating that the nitrogen content is high.
(4) Color reaction method: ammonium bicarbonate, ammonium carbonate is alkaline, can be boiled with carrot skin (or red leeks), take the clear liquid, put a small amount of ammonium bicarbonate into the clear liquid, if carrot skin It turns pure from purple to light green (or red amaranth juice changes from red to yellow green).
Phosphate Fertilizer The appearance of superphosphate should be gray granular, acidic, and partially soluble. Add calcium phosphate to a small amount of water. If it is partially dissolved, it can be preliminarily determined to be superphosphate. In the above carrot juice (or red leeks juice), if the solution changes from purple to bright red (or red leeks juice changes from red to deep red), the quality of superphosphate is good.
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