Look at: first look at whether the fertilizer is double-packed, and then see if the label, the production license number, the registration number for agricultural use, the standard code, the total nutrient content, the name and address of the manufacturer, and finally the inner bag Whether there is a product certificate or not, if the above logo is incomplete, it may be a counterfeit product.
Touch: The national standard stipulates that the moisture content of the three-element low-concentration compound fertilizer should be less than or equal to 5%. If it exceeds this index, it will feel sticky in the hands and can be pinched into cakes.
Burning: Take a small amount of compound fertilizer placed on the iron skin and burn it in an open fire. The ammonia odor indicates that it contains nitrogen, and the yellow flame shows that it contains potassium.
Smell: Compound fertilizers generally have no peculiar smell (except for organic-inorganic compound fertilizers). If there is odor, it is because the basic raw material nitrogen fertilizer mainly uses agricultural ammonium bicarbonate, or the basic raw material phosphorus fertilizer contains toxic substance trichloroacetaldehyde. When trichloroacetaldehyde enters the farmland, it will cause burning of seedlings, but it will result in crop failure, and the long-term residual period of toxicity will affect the growth of crops in the next season. Therefore, it is best for farmers' friends not to buy mixed fertilizers with odors.
Solution: High-quality compound fertilizer has good water-solubility, and most of the soaked in water can be dissolved. Even if there is a small amount of sediment, it is also small. The inferior compound fertilizer is hardly soluble in water, and the residue is rough and hard.
Taste: Because of the high price of potash in the market, some unscrupulous manufacturers act as potash after being crushed with red bricks. At the time of purchase, farmer friends can taste a few red granules, potassium chloride has a salty taste, and red brick particles do not.
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