First, look at the logo on the outer packaging
　　 1. Content label: 15 % of nitrogen, phosphorus and potassium , meaning that each effective nutrient should not be less than 15 %, and the total nutrient of 45 ± 1 is not more than 44 %. But the total nutrient means: nominally 45 nutrients, if the actual test results only have 43 nutrients, the difference between the two nutrients is also the price, and the lesser two nutrients are nearly 100 yuan / ton.
　　 2 , trace elements: trace elements have a certain effect on the growth of crops, but can not play a decisive role, some manufacturers exaggerate the role of trace elements, multi-standard trace element content, and then raise the price. Therefore, when buying, do not look at the price of the trace elements, but the price of the three nutrients of nitrogen, phosphorus and potassium. Special attention should be paid to the label. If it is nitrogen + potassium + medium trace elements (such as sulfur), this fertilizer is only a two-element fertilizer, and the medium and trace elements cannot be counted as total effective nutrients.
　　 3. Types of elements: The three-element fertilizer refers to fertilizers made of three elements: nitrogen, phosphorus and potassium. These three elements are three important nutrients necessary for crop growth. As the name implies, the fertilizer made of any two of the three elements of nitrogen, phosphorus and potassium is called the two-element fertilizer. Some distributors sell the two-element fertilizer instead of the three-element fertilizer to farmers and persuade them to use them. This long-term use will cause soil fertility to decline and affect crop growth. Fertilizers containing other medium and trace elements in addition to nitrogen, phosphorus and potassium are called multi-element fertilizers. At present, most of the trace elements in the multi-element fertilizer packaging on the market have not been added at all or the amount of addition is minimal, which does not play a real role. It only means misleading consumption and promoting sales, and should not be fooled.
Second, look at the chemical fertilizer test report
Whether it is imported fertilizer or domestic fertilizer, you should check the chemical fertilizer test report. The laboratory test report is best tested by the local quality inspection department.
　　 1. See what the contents of nitrogen, phosphorus and potassium are. Whether the content of water-soluble phosphorus is high, the higher the water-soluble phosphorus, the better.
　　 2. See what is the total nutrient (nitrogen, phosphorus, potassium) content.
　　 3 , look at the particle strength and water content, high strength, low water content is good, and then compared with the logo on the outer packaging, pay attention to the identification of the nutrient deviation, the smaller the better.
　　 4 , whether the chemical contains chlorine, chlorine is too high, has a negative impact on chlorine crops, such as the application of chlorine-containing fertilizers on vegetables, citrus, potatoes and other crops, affecting its quality, but reduce production and reduce income.
Third, select some reputable chemical fertilizer units to buy fertilizer, when buying, try to choose some well-known brands or compound fertilizers that have been used before.
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