Plant hormones, are specialised chemical substances produced by plants. Foliar fertilization is a particularly useful technique: and are the main internal factors controlling growth and development.
Hormones are produced in one part of a plant and transported to others, where they are effective in very small amounts.
Depending on the target tissue, a given hormone may have different effects.
Auxin, one of the most important plant hormones, is produced by growing stem tips and transported to other areas where it may either promote growth or inhibit it.
It also retards the abscission (dropping off) of flowers, fruits, and leaves.
Commercially, synthetic auxins are used to initiate adventitous roots from plant cuttings eg. in nurseries.
Weed control by another synthetic auxin, 2, 4-dichlorophenoxyacetic acid (2,4-D), is widespread as a selective herbicide against broadleaf weeds.
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