Liquid formulations offer the advantages of fl exibility by allowing
dilutions to various fi nal concentrations and uniform application to the base of
the cuttings, while powder formulations require no additional preparation prior to
use. Registered products in the United States include IBA (indolebutyric acid) and
IBA/NAA (indolebutyric acid / naphthaleneacetic acid) combinations in the form of
liquid concentrates, water-soluble tablets, and powders