The simple way to identify the authenticity and quality of potassium fertilizer is as follows.

1. Look at the packaging. The fertilizer packaging bag must be marked with the product name, nutrient content, grade, trademark, net weight, factory name, factory address, standard code, and production license number. If the above logo is missing or incomplete, it may be fake potash fertilizer or inferior quality.

2. Look at the appearance. Domestic potassium chloride is a white crystal, which turns light yellow when it contains impurities. Imported potassium chloride is mostly white crystals or red and white crystals. Potassium sulfate is a white crystal, which turns light yellow or off-white when it contains impurities.

3. Look at the water solubility. Take 1 gram of potassium chloride, potassium sulfate, and potassium dihydrogen phosphate, put it into a clean glass or white porcelain bowl, add 10 ml of clean cold water, stir evenly, and check the dissolution. Which one is completely dissolved without impurities? Potash fertilizer that cannot dissolve quickly and appears like porridge or has sediment is inferior potassium fertilizer or fake potassium fertilizer.

4. Do the charcoal test. Put a small amount of potassium chloride or potassium sulfate on red-hot charcoal or a cigarette butt. It should not burn or melt, but should make a "cracking" sound. If there is no such phenomenon, it is a fake and shoddy product.

5. Do the lime water test. Some manufacturers use ammonium phosphate and add a small amount of potassium fertilizer, or even no potassium fertilizer, and then mix it to fake potassium dihydrogen phosphate. Good quality potassium dihydrogen phosphate is white crystal. After adding lime water (or plant ash water), you will not smell ammonia. If it looks like white or off-white powder, you will smell ammonia after adding lime water (or plant ash water). smell, it is fake potassium dihydrogen phosphate.

6. Do a copper wire test. Dip a clean copper wire or electric stove wire into a small amount of potassium chloride or potassium sulfate, put it on the white wine flame and burn it. You can see the purple-red flame through the blue glass piece. If there is no such phenomenon, it is a fake product.