A simple method for identifying complex fertilizers
A look: high-quality compound fertilizer particles consistent, no hard blocks, powder less visible red small potassium particles, or white urea particles.
Second, rub the compound fertilizer by hand, leave a gray powder on the hands, and have a sticky feeling for the high-quality compound fertilizer.
Three-burning: Take a little compound fertilizer placed on the iron sheet and put it in an open flame to burn. There is ammonia odor indicating that nitrogen is contained, and a purple flame indicates that potassium is contained. The deeper the ammonia smell, the longer the purple flame is the high-quality compound fertilizer. On the contrary, it is a bad product.
Four soluble: high-quality compound fertilizer will dissolve in water, even if there is a small amount of precipitated powder, it is also smaller.
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