Single Screw And Barrel For Extruder Zhoushan Jinsheng Bimetallic Plastic Machinery Factory , https://www.jinshenggalloy.com
Go to a legal, regular marketing point to buy, do not buy temporary, squatting, stringing, and also check the "certificate" and "photo" when purchasing. If you do not have a business license, you must not buy it. Shop around, choose a vendor that is trustworthy, quality, and honest.
Second, check the packaging and identification
The package should have clear and eye-catching registered trademarks, nutrient content, grading standards and moisture content, non-primary elements, and other substances, content, weight and weight errors, production license number, product certification, quality execution. Standard, manufacturer and site, contact telephone number, etc. There are also product quality certificates, production license numbers, production dates and batch numbers, etc., which are generally in fertilizer bags.
Third, through the preliminary identification of perception
After opening the outer packaging, it is initially identified by eye and hand. First look at it. The fertilizer has good luster and bright colors, and it is dark and dull. The second is handcuffs. The palm of your hand is put on the fertilizer, and it is twisted twice. It is not broken, it is bad, and the harder the better, the better.
Master the nature of some fertilizers. All kinds of fertilizers have their unique physical and chemical properties, which can be distinguished by odor, water, fire, eye and other tasks.
Fourth, accounting costs
Calculating costs is related to the benefits of fertilization. Single-element fertilizer is cheaper than compound fertilizer, and high-concentration compound fertilizer is cheaper than reduced-concentration compound fertilizer. However, the application of single-element fertilizer is laborious and the compound fertilizer is light. If the nutrient unit price of a certain fertilizer (especially compound fertilizer) is significantly lower than other brands, care should be taken when purchasing.
V. Maintenance of rights and interests
Request an invoice or other related voucher. Samples should be kept after buying home. The retained samples should be packaged as completely as possible and consistent with the packaging label of the used product to ensure that both parties are recognized during the dispute. If it is found that the purchase of fake fertilizer should be reported in a timely manner, if it is found that the purchased fertilizer has an abnormal phenomenon such as damage to the crop, it should be reported to the quality and technical supervision department in a timely manner, and the site should be protected and the technician should be investigated and analyzed in order to take necessary remedial measures. Measures.
Tips for buying fertilizer
First, choose a legal dealer
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