The first thing to look at is to see if double-layer packaging is used. Look at the packaging bags for information such as trademarks and production license numbers. Finally, whether or not there is a product certification on the inner bag. If double-layer packaging or incomplete labeling is not adopted, it is most likely to be a shoddy product. When farmers open the inner bag, they must carefully check whether the grains of the compound fertilizer are consistent. If they are inconsistent, they are likely to be inferior products.
After touching the semi-finished compound fertilizer with your hands and rubbing it, if there is a layer of grayish white powder on the hand and there is a sticky feeling, fine white crystals are seen in the particles, indicating that it is an excellent product; if there is a layer of grayish black powder on the hands and No sticky sensation and no white crystals in the particles indicate poor quality.
The use of nose smells of compound fertilizer is generally no smell. If there is smell and the smell is heavy, it can be judged as inferior compound fertilizer. Such “compound fertilizers†will cause burning of seedlings after light use, heavy harvesting of crops, and long residual toxicity, which will affect the growth of the next season crop.
A small amount of compound fertilizer was placed on the iron skin and was burned in an open flame with fire. At this time, ammonia odor showed nitrogen, and the yellow flame showed potassium. The thicker the ammonia odor, the yellower the yellow flame, indicating that the higher the nitrogen and potassium content, the better the compound fertilizer; otherwise, it is the inferior compound fertilizer.
Water-soluble high-quality compound fertilizers have good water solubility, and most of them can be dissolved when immersed in water. Even if there are a small amount of precipitates, the precipitates are also small. The poor quality compound fertilizer is hardly soluble in water, and its residue is rough and hard. Both can see authenticity in the water.
After touching the semi-finished compound fertilizer with your hands and rubbing it, if there is a layer of grayish white powder on the hand and there is a sticky feeling, fine white crystals are seen in the particles, indicating that it is an excellent product; if there is a layer of grayish black powder on the hands and No sticky sensation and no white crystals in the particles indicate poor quality.
The use of nose smells of compound fertilizer is generally no smell. If there is smell and the smell is heavy, it can be judged as inferior compound fertilizer. Such “compound fertilizers†will cause burning of seedlings after light use, heavy harvesting of crops, and long residual toxicity, which will affect the growth of the next season crop.
A small amount of compound fertilizer was placed on the iron skin and was burned in an open flame with fire. At this time, ammonia odor showed nitrogen, and the yellow flame showed potassium. The thicker the ammonia odor, the yellower the yellow flame, indicating that the higher the nitrogen and potassium content, the better the compound fertilizer; otherwise, it is the inferior compound fertilizer.
Water-soluble high-quality compound fertilizers have good water solubility, and most of them can be dissolved when immersed in water. Even if there are a small amount of precipitates, the precipitates are also small. The poor quality compound fertilizer is hardly soluble in water, and its residue is rough and hard. Both can see authenticity in the water.
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