A chemical fertilizer containing one or more of the nutrients needed for crop growth. Short for chemical fertilizer. Fertilizer containing only one nutrient element with marked content is called unit fertilizer, such as nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, minor major element fertilizer and trace element fertilizer. A chemical fertilizer containing two or three of the three nutrient elements of nitrogen, phosphorus and potassium and its content can be marked is called compound fertilizer or mixed fertilizer. The solubility of effective components of chemical fertilizer in water is usually the standard to measure the effectiveness of chemical fertilizer. Grade is the main index of chemical fertilizer quality, which refers to the content percentage of effective nutrient elements or their oxides in chemical fertilizer products, such as nitrogen, phosphorus, potassium, calcium, sodium, manganese, sulfur, boron, copper, iron, molybdenum and zinc.

Phosphorus fertilizer, nitrogen fertilizer and potassium fertilizer are the chemical fertilizers in great demand for plants.