When purchasing compound fertilizer, the first thing to check is whether it comes in double-layer packaging. This helps ensure the product has not been tampered with or exposed to moisture. Examine the outer bag for clear markings such as the brand name, production license number, and any official certifications. Then, check the inner bag for a product certification label. If the packaging is single-layer or lacks proper labeling, it could be a sign of a low-quality or counterfeit product.
Once you open the inner bag, take a close look at the granules. High-quality compound fertilizers should have uniform, consistent particles. If the grains are irregular, discolored, or feel too fine or too coarse, it may indicate that the product is substandard.
Next, take a small amount of the fertilizer in your hand and rub it between your fingers. A high-quality product will feel smooth, with no excessive dust. If you notice a layer of grayish-white powder on your hands, along with a slight stickiness, and you can see small white crystals within the granules, this is a good sign. On the other hand, if there's a dark gray or black residue on your hands, no stickiness, and no visible crystals, the quality is likely poor.
Smelling the fertilizer is another important step. Genuine compound fertilizers usually have little to no odor. However, if you detect a strong, unpleasant smell—especially a pungent or chemical-like scent—it may indicate the presence of harmful additives or impurities. These types of fertilizers can damage seedlings, reduce crop yield, and leave long-term residues that affect future planting seasons.
To test for nutrient content, place a small amount of the fertilizer on a metal surface and hold it over an open flame. If the fertilizer emits a strong ammonia smell, it indicates a high nitrogen content. A yellow flame suggests the presence of potassium. The stronger the ammonia odor and the more vivid the yellow flame, the better the quality of the fertilizer. If the reaction is weak or absent, it may be a lower-quality product.
Finally, test the solubility of the fertilizer by placing a small quantity in a container of water. High-quality compound fertilizers dissolve quickly and completely, leaving only a small amount of fine sediment if any. Poor-quality products, however, will remain mostly undissolved, with large, hard residues that do not mix well with water. This simple test can help distinguish genuine from fake products. Always make sure to purchase from reputable suppliers to ensure the quality and safety of the fertilizer you use.
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