Compound fertilizers increase yield and income compared with single fertilizers. Therefore, how to purchase high-quality compound fertilizers according to the characteristics of soils and fertilizers and the status of agricultural production, in order to achieve the purpose of increasing production, is the need for farmers to understand and master.
1. According to the soil traits, the selection of compound fertilizers for slightly alkaline, soil organic matter content is low, and soils with effective nitrogen and phosphorus deficiency should generally use chemical acid nitrogen and phosphorus compound fertilizers, such as monoammonium phosphate or humic acid NPK. Compound fertilizer, nitrogen and phosphorus compound fertilizer is suitable.
Second, according to crop varieties, scientific selection of compound fertilizers, general field crops use nitrogen and phosphorus compound fertilizer, wheat or high-yield fields, should use NPK ternary compound fertilizer; wheat, rice, millet and other close crops, suitable for powdery compound fertilizer; For planting crops such as corn, granular compound fertilizer should be used; vegetables, especially fruit crops, root vegetables and fruit trees, need more potassium, and should use NPK compound fertilizer with higher potassium and lower nitrogen.
Third, according to the nature of compound fertilizer, scientific selection of relevant standards for compound fertilizers, effective nutrient content of compound fertilizer, high concentration of NPK ≥40%, low concentration ternary NPK ≥25%, binary NPK The content is ≥20%, excluding trace elements and medium elements, the water-soluble phosphorus content is ≥40%, the moisture content is less than 5%, and the particle size is 1-4.75 mm. In addition to looking at the trademark and nutrient content, you should pay attention to the manufacturer and the place of origin when purchasing the compound fertilizer. In addition, there are two kinds of potassium in the compound fertilizer, one is potassium chloride and the other is potassium sulfate. Where there is no "S" symbol on the composite fertilizer bag, the potassium is potassium chloride, and the chlorine crops such as grapes, potatoes, tobacco, sugar beets, etc. must not be applied.
4. Selecting compound fertilizer scientifically according to fertilization method In order to improve the fertilizer efficiency of compound fertilizer, different application methods should choose 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. For topdressing application, powdered compound fertilizer should be applied, and it should be noted that the water-soluble phosphorus content in phosphorus in compound fertilizer should be greater than 40%. Generally, the effect of humic acid compound fertilizer is better than the effect of topdressing.
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