Compound fertilizers have increased production and income than single-fertilizers, and have long been recognized by farmers. However, how to purchase high-quality compound fertilizer to achieve the goal of increasing production and saving money has not yet been mastered by the majority of farmers. In addition, there are many kinds of compound fertilizers on the market, and the name is novel and difficult to be recognized by farmers. To this end, based on soil characteristics and agricultural production status, the following recommendations are made on how to purchase high-quality compound fertilizer. 1. Selecting compound fertilizer according to soil traits The pH value of the soil in Chaoyang area is generally about 8.0, which is slightly alkaline and the soil organic matter content is low. Lack of available nitrogen and phosphorus. Therefore, chemical acid nitrogen and phosphorus compound fertilizers, such as monoammonium phosphate or humic acid nitrogen, phosphorus and potassium compound fertilizers, nitrogen and phosphorus compound fertilizers should be used. However, for a small number of red clay or acid brown soil in eastern Liaoning, chemical alkaline compound fertilizers such as diammonium phosphate should be used. Second, the choice of compound fertilizer according to the general scientific crop varieties selected field crops NP compound feed, wheat or Canopy Apparent yield, NPK fertilizer should be used; wheat, rice, millet and other crops high density, suitable for use powdery compound Fertilizer; thin-grained crops such as corn should use granular compound fertilizer; vegetables, especially fruit crops, root vegetables and fruit trees and other economic crops need more potassium, should use potassium and phosphorus with higher potassium and potassium fertilizer, not only increase production but also Helps improve crop quality. Third, according to the nature of compound fertilizer scientific selection of compound fertilizers Currently, a large number of compound fertilizers sold on the market do not meet the standards stipulated in the national GB15063-94 document, that is, fake compound fertilizer. According to the state regulations, the effective nutrient content of standard compound fertilizer, the total concentration of high concentration of NPK ≥40%, the low concentration of ternary NPK ≥25%, the binary NPK content ≥20%, excluding trace elements and medium The amount of elements, water-soluble phosphorus content ≥ 40%, moisture content less than 5%; particle size of 1-4.75 mm. The content is not less than 80%; the pressure resistance is 2.0-2.8 mm, and the hardness is not less than 6 Newtons. In the current market, except for the compound fertilizer produced by a few manufacturers, most of the small and medium-sized compound fertilizer plants produce compound fertilizers that do not meet the above criteria. Therefore, in addition to looking at the trademark and nutrient content when purchasing compound fertilizer, it is also necessary to pay attention to the manufacturer and the place of origin. In addition, there are two kinds of potassium in the compound fertilizer, one is potassium chloride and the other is potassium sulfate. Potassium chloride contains chlorine, which is not suitable for chlorine-free crops. Where there is no "S" symbol on the composite fertilizer bag, the potassium is potassium chloride type potassium, and the chlorine crops such as grapes, potatoes, tobacco, beets, etc. must not be applied. The fertilizer bag must be marked with the "S" symbol. Compound fertilizer, a compound fertilizer consisting of potassium sulfate. 4. According to the fertilization method, the compound fertilizer is scientifically selected to improve the fertilizer efficiency of the compound fertilizer, and different application methods should select different compound fertilizers. Granular compound fertilizer must be used for the application of base fertilizer, and the higher the hardness of the particles, the better. For example, the hardness of diammonium in the United States is the largest and the fertilizer is the longest. Moreover, the compound fertilizer composed of ammonium in the compound fertilizer is selected to improve the utilization rate of nitrogen. If applied as top dressing, apply powdery compound fertilizer, and pay attention to the water-soluble phosphorus content of phosphorus in compound fertilizer should be more than 40%, and nitrogen compound fertilizer composed of NH4-N and NO3-N should. Generally, the effect of humic acid compound fertilizer is better than the effect of topdressing.