Can plants fertilize their leaves?

Leaf (root) fertilizer is a fertilizer sprayed on plant leaves and can be absorbed and utilized by them, also known as root topdressing. It may contain a small amount of natural plant growth regulators, but it may not contain chemically synthesized plant growth regulators. Plant growth auxiliary substance fertilizer: it is made of natural organic extract or fermentation broth inoculated with beneficial bacteria, and some nutrients such as humic acid, amino acids, algae, vitamins and sugar are added. Trace element fertilizer: fertilizer mainly containing trace elements such as copper, manganese, iron, zinc, boron and molybdenum.