A look at whether the fertilizer is double-layered and whether the three licenses (production license, fertilizer registration certificate, product certification) are complete and effective. Look at the packaging bag again to see whether the trademark, number, standard code, total nutrient content, the name and address of the manufacturer, and finally see whether the inner packaging bag fertilizer particles are the same, no large lump, less powder. If you use Canadian potash fertilizer, you can see small red potassium fertilizer particles. Compound fertilizers with higher nitrogen content can retain many attached white or colorless fine crystals on the surface of the fertilizer for a period of time. This crystal is formed due to the absorption of moisture by urea and potassium chloride. This is not the case with inferior compound fertilizers. The second national standard stipulates that the moisture content of the low-concentration compound fertilizer should be less than or equal to 5%. If the moisture content exceeds this index, the feeling in the hand is sticky, and the second is that it can be kneaded into a cake, which will inevitably make the fertilizer particles. The compressive strength is reduced, and the slow release properties of the compound fertilizers are lost. Grab half of the compound fertilizer by hand and knead it. There is a layer of grayish powder on the hand and a sticky sensation is of good quality. If the granules are touched, the fine white crystals are also shown to be of good quality. Inferior compound fertilizers are mostly grayish black powders with no stickiness and no white crystals in the particles. Three burning a small amount of compound fertilizer placed on the iron skin, burning in an open flame, there is ammonia odor that contains nitrogen, yellow flame shows that contains potassium. The thicker the ammonia odor, the yellower the yellow flame, indicating that the higher the content of nitrogen and potassium, it is a high-quality compound fertilizer. On the contrary, it is a poor quality compound fertilizer. Four smell compound fertilizers generally have no odor (except organic compound fertilizers). If there are odors, it is because the basic raw material nitrogen fertilizer is mainly used for agricultural ammonium bicarbonate, or the basic raw material contains toxic substances trichloroacetaldehyde (acid) phosphate fertilizer. . If triclosan (acid) enters the farmland, it will cause burning of seedlings, heavy crops will be rejected, and the period of toxic residues will remain long, which will affect the growth of the next crop. Therefore, it is best for farmers not to buy odor-rich compound fertilizers. Five soluble high-quality compound fertilizers have good water solubility, and most of them can be dissolved, even if there is a small amount of precipitates. The inferior compound fertilizer is hardly soluble in water, and the residue is rough and hard. Six tastes are due to the relative lack of potash fertilizer on the market, and the prices are higher. Some illegal manufacturers act as potash fertilizers after being crushed with red bricks. At the time of purchase, farmers' friends can taste red granules, potassium chloride has a salty taste, and red brick particles have no salty taste. Vinegar,White Rice Vinegar,White Vinegar,Millet Vinegar Chinese Seasoning (Shandong) Trading Co.,Ltd , https://www.zt-trading.com
Simple identification method of superior and inferior compound fertilizers
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