The compound fertilizer purchased from the market is printed with nutrient content in the packaging bag, ie in the order of n (nitrogen), p (phosphorus), k (potassium) three elements, marked with "20-20-15" or " 15-15-10" and a set of numbers. This means that the nutrient content of this elemental compound fertilizer is: nitrogen 20%, phosphorus 20%, potassium 15% or nitrogen 15%, phosphorus 15%, potassium 10%, and some compound fertilizers are marked with four numbers, indicating that Compound fertilizers contain other elements in addition to nitrogen, phosphorus, and potassium. In addition, if one of the three numbers is “oâ€, such as “15-o-15â€, then this compound fertilizer contains only 15% nitrogen, 15% potassium, and no phosphorus. The compound fertilizer can be used For top dressing. According to the calculation of the effective nutrient content of the compound fertilizer, generally 10 kg of ternary compound fertilizer labeled “15-15-10†is applied per acre, equivalent to approximately 3.3 kg of urea per gram, 7.7 kg of superphosphate, and 2.5 parts of potassium chloride per acre. kg. There are two kinds of potassium in compound fertilizers, one is potassium chloride, the other is potassium sulfate, and potassium chloride contains chlorine, but it is not suitable to use chlorine crops. There is no potash fertilizer marked with “s†symbol on compound fertilizer bags. Are potassium chloride potassium, avoid chlorine crops do not apply. Different dosage methods should use different formulations of compound fertilizers. For the application of basal fertilizer must be selected granular compound fertilizer, the higher the hardness of the particles, the better. The compound fertilizer with compound nitrogen in ammonium fertilizer was used to improve the utilization of nitrogen. For top dressing application, powdery compound fertilizer should be selected.
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