The root system of plants is the main organ for plants to absorb nutrients and water. The absorption of nutrients by plant roots is the core of plant nutrition.

Root process generally includes the following four processes: nutrient migration from soil to root surface; Nutrients enter the free space in the root from the root surface and gather on the outer surface of the cell membrane; Nutrients enter the protoplast through the cell membrane; Nutrients are transported from roots to aboveground parts.

Plants can absorb nutrients not only through roots, but also through leaves and other parts of the ground. This nutrition is called leaf nutrition or root nutrition.

Compared with root nutrition, foliar fertilization is a fast and efficient fertilization method.

Foliar spraying can also prevent soil from fixing nutrients, which is very beneficial to the application of trace element fertilizers such as zinc, copper, iron and manganese.