Strictly speaking, foliar fertilizer is not a classification of fertilizers, but a method of fertilization. In addition to absorbing nutrients through the roots of crops, the leaves can also absorb nutrients. Foliar fertilizer is a way of supplementing nutrients through crop leaves, so foliar fertilization is also called extra-root topdressing or foliar spraying.

Foliar fertilizer is a kind of extra-root topdressing, which is directly sprayed on the surface of the leaves and absorbed by the leaves to transport nutrients to all parts of the crop. It mainly plays a role in making up for insufficient root fertilizer supply, balancing crop nutrition, or alleviating temporary shortages in a certain growth period of crops.

There are many types of foliar fertilizers. According to their functions and functions, foliar fertilizers can be summarized into four categories: nutrient type, regulating type, biological type and compound type.

01. Nutritional foliar fertilizer

This type of foliar fertilizer has a relatively high content of nutrients such as nitrogen, phosphorus, potassium and trace elements, and its main function is to provide crops with various nutrients and improve the nutritional status of crops, especially suitable for supplementing various nutrients in the later stage of crop growth.

02. Adjustable foliage fertilizer

This type of foliar fertilizer contains substances that regulate plant growth, such as auxins, hormones and other ingredients. The main function is to regulate the growth and development of crops, etc., and is suitable for use in the early and middle stages of plant growth.

03. Biological foliar fertilizer

Such fertilizers contain microorganisms and metabolites, such as amino acids, nucleotides, and nucleic acids. The main function is to stimulate crop growth, promote crop metabolism, reduce and prevent the occurrence of pests and diseases.

04. Compound foliage fertilizer

There are many types of such foliar fertilizers and various compound and mixed forms. It has many functions. A foliar fertilizer can not only provide nutrition, but also stimulate growth and regulate development.