First, look at it with an eye: first look at whether the fertilizer is double-layered, and then look at the label on the label to indicate the trademark, production license number and other information. Finally, it depends on whether the inner bag has a product certificate. If the aforementioned logo is incomplete, it is highly likely that it is a counterfeit product. When the farmer opens the inner bag, he should also carefully check whether the particles of the fertilizer are consistent, without large lumps. If used with Canadian potash, red fine potassium fertilizer particles can be seen. If you do not have the above traits, it may be a counterfeit product.
The second is to touch by hand: If you use the hand to grab half of the compound fertilizer, then there will be a layer of gray-white powder on the hand and a sticky feeling for the excellent product; if you touch the particles, it can be seen that the fine white crystals are also excellent. product. On the contrary, most of the inferior compound fertilizers are gray-black powder, which has no stickiness when rubbed on the hands and no white crystals in the particles.
The third is to use fire: a small amount of compound fertilizer is placed on the iron sheet and placed in an open flame to burn. At this time, the description of ammonia smell contains nitrogen, and the yellow flame indicates potassium. And the more ammonia smell, the yellower the yellow flame, indicating that the higher the nitrogen and potassium content, the better compound fertilizer. On the contrary, it is a poor quality compound fertilizer.
The fourth is to use the nose to smell: compound fertilizers generally have no odor. If there is an odor and the odor is heavy, it can be judged as a poor quality compound fertilizer. Such "complex fertilizer" will cause burning of the seedlings after use, and the crops will be rejected, and the toxicity remains for a long time, which will also affect the growth of the next season crop.
The fifth is water-soluble: high-quality compound fertilizer has good water solubility, most of which can be dissolved in water, even if there is a small amount of sediment. The inferior compound fertilizer is more difficult to dissolve in water, and its residue is rough and hard. Both can see the truth in the water.
The second is to touch by hand: If you use the hand to grab half of the compound fertilizer, then there will be a layer of gray-white powder on the hand and a sticky feeling for the excellent product; if you touch the particles, it can be seen that the fine white crystals are also excellent. product. On the contrary, most of the inferior compound fertilizers are gray-black powder, which has no stickiness when rubbed on the hands and no white crystals in the particles.
The third is to use fire: a small amount of compound fertilizer is placed on the iron sheet and placed in an open flame to burn. At this time, the description of ammonia smell contains nitrogen, and the yellow flame indicates potassium. And the more ammonia smell, the yellower the yellow flame, indicating that the higher the nitrogen and potassium content, the better compound fertilizer. On the contrary, it is a poor quality compound fertilizer.
The fourth is to use the nose to smell: compound fertilizers generally have no odor. If there is an odor and the odor is heavy, it can be judged as a poor quality compound fertilizer. Such "complex fertilizer" will cause burning of the seedlings after use, and the crops will be rejected, and the toxicity remains for a long time, which will also affect the growth of the next season crop.
The fifth is water-soluble: high-quality compound fertilizer has good water solubility, most of which can be dissolved in water, even if there is a small amount of sediment. The inferior compound fertilizer is more difficult to dissolve in water, and its residue is rough and hard. Both can see the truth in the water.
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