Take a look: try to choose shops, commodity enterprises and manufacturers with legal procedures, scale and credibility to buy.
Second, look: product certificate, fertilizer inspection form and ask for purchase and sale vouchers to prevent fertilizer quality disputes.
Third look: the nutrient composition, use, usage and precautions of fertilizer.
Fourth, look: whether the fertilizer production enterprise has gone through the relevant procedures. For example, the production of foliar fertilizer and microbial fertilizer requires the fertilizer registration certificate of the Ministry of Agriculture; The production of compound fertilizer and organic fertilizer requires a provincial fertilizer registration certificate, and the production of compound fertilizer requires a production license.
If you buy imported fertilizer, I suggest you look at their business license, EU certification and import and export customs certificate. Oh, that's what I saw when I bought a carbon supplement. I hope to remind you.