As a kind of plants, flowers have little demand for fertilizers, but they are also essential substances. Among them, 16 elements are necessary for flower growth and development, namely carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, boron, manganese, copper, zinc, molybdenum and chlorine. Among them, elements such as carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium and sulfur are called "macro elements" because of the large demand for flowers, while elements such as iron, boron, manganese, copper, zinc, molybdenum and chlorine are called "trace elements" because of their low content in plants. Among them, nitrogen, phosphorus and potassium are most needed by flowers, and the effective content in soil is less. They must be fertilized to meet the growth needs of flowers, which is the so-called "three elements of fertilizer"

Although the relative contents and demands of various nutrient elements in flowers vary greatly, they are all necessary, and the physiological functions of various elements are equally important and irreplaceable. Therefore, both macro elements and trace elements have their special physiological functions and are equally important. When an element shows symptoms of deficiency, it can only be restored to normal growth by applying this element fertilizer.