1. How to identify nitrogen fertilizers. If you buy ammonium bicarbonate, or ammonium nitrate, ammonium sulfate, or ammonium chloride, you can extract 10 grams of sample, put it into a clean glass, add 50 ml of water, stir and shake until the fertilizer particles are completely dissolved, and use a paper towel to Dip into the cup to get the solution, let dry slightly, then bake on the stove for 2-5 minutes. If the paper exudes a pungent nitrogen smell, it indicates that it is one of the above-mentioned nitrogen fertilizers, otherwise it is a fake nitrogen fertilizer.

2. Use the fire method to simply identify several chemical fertilizers. Extract 15-20 grams of chemical fertilizer sample. First prepare a piece of very red charcoal that is burning vigorously (no open flames are allowed). Place the sample directly on the red-hot charcoal block. Observe the reaction phenomenon that occurs to identify the type of fertilizer: What smokes and melts immediately upon contact with carbon red is urea; what burns violently, explodes into stars, and emits a nitrogen smell is ammonium nitrate; what does not burn but emits an ammonia smell is ammonium sulfate; what explodes The one that makes a sound, but does not have the smell of ammonia, is potassium chloride; the one that burns with a yellow flame when burning is sodium nitrate; the one that burns with a purple flame when burning is potassium nitrate; the one that burns slowly and leaves a white color after burning The residue is nitrate perch; the residue burns very slowly, smells like hot chicken feathers, and remains with black residue, which is bone meal. If any of the above reactions does not occur, it is fake fertilizer.

3. Distinguish true and false compound fertilizers. Take a handful of compound fertilizer and place it on a piece of frosted glass and observe it under the illumination of a 100-watt incandescent electric light. The fertilizer particles are shiny. If you crush the fertilizer particles, you will see that the lens is rich in refraction and it is a true compound fertilizer. The fat grains are dull in color, not shiny, off-white on the outside, mottled on the inside, non-refractive, and are fake fat. Put the sample into clean water and what can be dissolved is the real compound fertilizer. What doesn’t dissolve is fake fertilizer.