In general, N, P2O5, and K2O on chemical fertilizer bags respectively represent nitrogen, phosphorus pentoxide, and potassium oxide, and the corresponding figure below indicates the percentage of chemical fertilizer. For example, writing N, P2O5, K2O, and writing 20-20-0 in the downward direction means that this fertilizer contains 20 kg of nitrogen and 20 phosphorus pentoxide per 100 kg, while the content of potassium oxide is zero, that is, this fertilizer does not contain potassium. .
These symbols also indicate the types of chemical fertilizers. Fertilizers containing three elements of nitrogen, phosphorus, and potassium are called ternary compound fertilizers, and only two of them are called binary compound fertilizers, but only one of them. It is called a single fertilizer. Some K2Os on chemical fertilizer bags are marked with (S), indicating that the potassium in the fertilizer is potassium sulfate; if K2O is followed by (CL), the potassium in the fertilizer is potassium chloride.
In addition, some fertilizer manufacturers produce fertilizers that are used only for certain crops or certain types of crops depending on the differences in nitrogen, phosphorus, and potassium requirements of different crops. They are called special compound fertilizers such as rice compound fertilizer, soybean compound fertilizer, etc. The production should be used according to the crop name marked on the fertilizer package.
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