First, nitrogen fertilizer: Urea, ammonia sulfate, ammonia bicarbonate, ammonium chloride and other fertilizers are white crystal appearance, can be identified by the following methods.
Burning method: A small amount of fertilizer can be placed on a piece of iron and burned on a flame. If there is a strong irritating odor and no residue is left, the nitrogen fertilizer is of high purity; if there are more residues, it means that the nitrogen content is low. Principle: The ammonium nitrogen will decompose after being heated.
Dissolution method: You can use a small amount of fertilizer, put a small amount of water, if all dissolved, indicating that the nitrogen content of high purity, if there is some or all insoluble, containing more impurities. Rationale: Ammonium nitrogen can be dissolved in water.
Second, phosphate fertilizer: The appearance of superphosphate should be gray granular, acidic, and partially soluble. Take calcium phosphate to add a small amount of water, if there is partial dissolution, it can be preliminarily determined that it is superphosphate. After testing with the above-mentioned red radish skin juice, if the solution changes from purple to bright red, the quality of superphosphate is good.
III. Compound Fertilizer: The particles of the real compound fertilizer are round and uniform in size. The particles of the fake compound fertilizer are of different shapes and the phenomenon of grave particles is serious. Hold the number of compound fertilizer on hand and let go of the height of 1.5 meters to let it fall freely and repeat. Two or three times, if the sound is on the ground, the sound is false; the weight of the compound fertilizer is greater than that of the fake compound fertilizer, and the compound fertilizer with 25 kg is used. The real fertilizer is small and the bulk of the fake fertilizer is large. Place a few compound fertilizers in a damp tray and let them absorb moisture for three or four minutes. Faster moisture absorption is false. Slower moisture absorption is true.
Burning method: A small amount of fertilizer can be placed on a piece of iron and burned on a flame. If there is a strong irritating odor and no residue is left, the nitrogen fertilizer is of high purity; if there are more residues, it means that the nitrogen content is low. Principle: The ammonium nitrogen will decompose after being heated.
Dissolution method: You can use a small amount of fertilizer, put a small amount of water, if all dissolved, indicating that the nitrogen content of high purity, if there is some or all insoluble, containing more impurities. Rationale: Ammonium nitrogen can be dissolved in water.
Second, phosphate fertilizer: The appearance of superphosphate should be gray granular, acidic, and partially soluble. Take calcium phosphate to add a small amount of water, if there is partial dissolution, it can be preliminarily determined that it is superphosphate. After testing with the above-mentioned red radish skin juice, if the solution changes from purple to bright red, the quality of superphosphate is good.
III. Compound Fertilizer: The particles of the real compound fertilizer are round and uniform in size. The particles of the fake compound fertilizer are of different shapes and the phenomenon of grave particles is serious. Hold the number of compound fertilizer on hand and let go of the height of 1.5 meters to let it fall freely and repeat. Two or three times, if the sound is on the ground, the sound is false; the weight of the compound fertilizer is greater than that of the fake compound fertilizer, and the compound fertilizer with 25 kg is used. The real fertilizer is small and the bulk of the fake fertilizer is large. Place a few compound fertilizers in a damp tray and let them absorb moisture for three or four minutes. Faster moisture absorption is false. Slower moisture absorption is true.
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