"Four-seeing" is: a look at the business qualifications of chemical fertilizer operators, whether there are legal procedures such as operating chemical fertilizer business licenses. Try to choose a store, or a company that is legal, large-scale, and reputable. Second, look at the product certificate, fertilizer inspection form, and request purchase and sales vouchers (in case there is fertilizer quality disputes). Third, look at the fertilizer logo, identify the type and nature of the fertilizer, and understand the nutrient content, use, usage, and precautions of the fertilizer. The national standard GB18382-2001 (Content requirements for fertilizer identification) stipulates that the fertilizer must indicate the total nutrient content (only N+P2O5+K2O) and must not add medium and trace elements or organic matter to the total nutrients. However, when inspections were conducted by relevant departments, there were still companies that added trace elements or organic matter to total nutrients to deceive consumers. Farmers and brothers should pay attention to this situation. Also note that when compound fertilizers are marked with chlorine or chloride ions, they should be avoided or used with caution in tobacco and other chlorine-tolerant crops. Use on seedlings should be kept away from the roots to avoid burning seedlings. Fertilizers marked with nitrate nitrogen are used with caution in paddy fields to avoid loss of nitrate nitrogen. Fourth, see if the fertilizer companies have gone through the relevant formalities. For example, the use of foliar fertilizers and microbial fertilizers is required to apply for the fertilizer registration certificate of the Ministry of Agriculture; for the use of compound fertilizers and organic fertilizers, provincial-level fertilizer registration certificates are required, and compound fertilizers are used for production licenses.

"Four Don'ts" is: Don't try to be cheap, ignore quality, and buy fake and bad fertilizers to avoid unnecessary losses. At present, the qualified rate of phosphate fertilizers and compound fertilizers is relatively low, especially potassium dihydrogen phosphate, which causes confusion in identification and counterfeit products. Second, do not look at "big" or "small". Some products are marked with brand names in order to show off the selling points, and to check with the supervision department, the substance is marked in small print. For example, “Russia” is marked with large letters in prominent places, “adopted” or “raw materials” are marked in small letters, causing people to mistakenly think that they are importing products; and others are marked with “potassium sulfate type” in a conspicuous position in an inconspicuous place. Mark "chlorinated" for the purpose of disrupting audiovisual. Third, do not be confused by the new concept. Some of the products are branded as high-tech products. They have made large-scale productions on the packaging and marked them with high-tech names such as "biology," "activation," and "green." They are actually general products. Fourth, don't admit to "unlucky". When falsifying chemical fertilizers or fertilizers are found in use, they should be promptly reported to the local agricultural authorities, technical supervision departments, industrial and commercial departments, and consumer associations.

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