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There are many varieties of chemical fertilizers that are used to prepare for purchase of chemical fertilizers, and fake and shoddy products are also flooding the market. Therefore, farmers must pay attention when buying fertilizers. Here are some simple identification methods: Packaging materials: The outer bag is a plastic woven bag, and the inner bag is a high density or low density or modified polyethylene film bag (only ammonium bicarbonate inner bag can be used for PVC film bag), also available Two-in-one compound bag (plastic woven cloth/film), but ammonium bicarbonate is not used for compound bag packaging. For example, in compound bags, Ca, Mg, P fertilizer and ammonium nitrate should be packed in three-in-one bags (plastic woven bags/membrane/kraft paper). Calcium, magnesium and phosphate fertilizers are also available in cloth/paper combo bags (plastic woven bags). / Kraft paper). Any packaging material that does not meet the above requirements may be fake and shoddy products. The signs on the bags: The bags should be marked with the name of the fertilizer, nutrient content, grade, net weight, implementation of the standard number, the name of the manufacturer, the site, and there are fertilizer registration certificates, production license numbers and so on. If the above signs are not complete or incomplete, it may be counterfeit products. If it is bulk fertilizer (superphosphate, phosphate rock, etc.), because of its nutrient content can not be identified from the appearance, to obtain the factory quality assurance, it is best to send the quality inspection department to test after the quality of the purchase price. Also pay attention to whether the packaging is intact, if you find the traces of unsealing, re-seal signs or use the old packaging, generally do not buy. Fertilizer name can not appear "XX King", "XX crystal (fine)", "XX treasure", "XX spirit" and other words. In addition, when purchasing compound fertilizers, it is also necessary to pay attention to the net content of products, total nutrient content, and the contents of nitrogen, phosphorus, and potassium, respectively. The nutrient content mainly refers to the content of nitrogen, phosphorus, and potassium. If intermediate (sulfur, calcium, magnesium, sodium) or trace elements (copper, zinc, iron, manganese, molybdenum, and boron) are added to the product, they should be marked separately. The content and total content of elements, the content of each trace element and the total content. No nitrogen + phosphorus + potassium + sulfur + calcium + magnesium + sodium + copper + zinc + iron + manganese + molybdenum + boron ≥ 58%, 85% and other standard methods. The products based on calcium-, magnesium-, phosphorus-, and fertilizer-based phosphatic-based phosphate fertilizers should be marked as "solubilized phosphorus." If the product contains nitrate nitrogen, it should be marked on the packaging container "containing nitrate nitrogen." If the mass fraction of chlorine ions in the product is greater than 3%, "chlorine-containing" should be marked on the packaging container. When there are additives in the product within the specified net content of each bag, it must be mixed evenly with the original material and must not be put into the packaging bag in a small package. In addition, it should also pay attention to retain the fertilizer certificate. (Haicang Agricultural and Broadcasting School)