How to choose compound fertilizer

First, look at the label on the outer packaging 1, content identification: nitrogen, phosphorus, potassium 15% or 12% nitrogen, phosphorus 18%, 15% single nutrient means that each effective nutrient can not be less than 14%, total nutrients 45 1 is that no less than 44% of the three nutrients must be added together. However, the total nutrients mean: 45 nutrients are nominal, if the actual test results are only 43 nutrients, the poor 2 nutrients are also considered prices, and the two less nutrients worth nearly 100 yuan / ton. 2, trace elements: trace elements have a certain effect on the growth of crops, but can not afford 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 level of the price of trace elements in terms of the number of trace elements, but to calculate the price based on the content of the three nutrients of nitrogen, phosphorus, and potassium. Special attention should be paid to the identification. If it is nitrogen + potassium + trace elements (such as sulfur), this fertilizer is only a two-element fertilizer, and the trace elements cannot be counted as the third effective nutrient. 3, the type of elements contained: three elements of fertilizer refers to the potassium, nitrogen, phosphorus made of three kinds of chemical fertilizers, these three elements are the three important nutrients necessary for crop growth. As the name implies, nitrogen, phosphorus, and potassium are two kinds of chemical fertilizers made of two elements called two-element fertilizer. Some dealers sold two-element fertilizers instead of three-element fertilizers to farmers and encouraged them to use them. This long-term use would cause the decline of soil fertility and affect the growth of crops. In addition to nitrogen, phosphorus, potassium in addition to other trace elements in the fertilizer called multi-element fertilizer. At present, most trace elements in the multi-element fertilizer packaging label on the market have not been added at all or have been added in a very small amount. This does not have a real effect. It is simply misleading consumption, promoting sales, and not to be fooled. Second, look at the chemical fertilizer test report Whether it is imported fertilizer or domestic fertilizer should check the chemical fertilizer test report. The laboratory report is best tested by the geological inspection department. 1, see the nitrogen, phosphorus, potassium content for each. Whether the content of water-soluble phosphorus is high, the higher the water-soluble phosphorus, the better. 2, see the total nutrient (nitrogen, phosphorus, potassium) content is. 3, look at the particle strength and moisture content, high strength, low moisture content as well, and then with the logo on the outer packaging comparison, pay attention to see the identification of nutrient deviation, the smaller the better the better. 4. Whether the chemical fertilizer contains chlorine or contains too much chlorine may have adverse effects on some crops. For example, the application of chlorine-containing fertilizers to crops such as vegetables, oranges, and sweet potatoes will affect the quality of the crops, and reduce the yield and income. Third, select some well-resourced fertilizer sales units to purchase fertilizers. When buying, try to choose some well-known brands or fertilizers that have been used before and have good effects.

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