Visual inspection 1. Look. Fertilizer particles have good gloss and bright colors, and they are dark and light. 2. Handcuffs. Put the palm of your hand into a fertilizer and twist it twice. If you don't break it, you will be better off. 3. Water soluble. Take a small amount of nitrogen and potassium fertilizer into the water and stir for 5 minutes. It can be completely dissolved and is not completely dissolved. Diammonium phosphate dissolves in water, but the melting time is longer. 4. Burn it. High-quality nitrogen fertilizers and phosphate fertilizers can be fired. The longer the melting time is, the less the remaining impurities are. The better the time, the longer the melting time is. Compound fertilizers can be burned with fire, and the longer it takes to melt, the better. 5. Potash. There are white, red, pink, red potash fertilizer is generally imported potassium, the best quality, potassium taste with the tongue, spicy taste is superior, spicy taste is inferior. Compound fertilizer tasted spicy with its tongue, indicating that it contained potassium.
When leaving evidence to purchase chemical fertilizers, you must leave receipts and related tickets so that you can file claims when problems arise.
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