Advances Using Indole-3-butyric Acid (IBA) Dissolved in Water for—Rooting Cuttings, Transplanting, and Grafting
Since the 1930s the plant growth regulator indole-3-butyric acid (IBA) has been used in the rooting of cuttings and other growth processes. Other uses for IBA include promoting root regeneration when transplanting plants and to possibly improve grafting success. Concentrations used for rooting range from 10 to 20,000 ppm IBA. The method of use and concentration of IBA is determined by many variables including plant type, time of year, propagation conditions, etc.
Liquid sources of IBA include premixed concentrated liquids containing up to 1.03% IBA dissolved in organic solvents such as ethanol (up to 99.5%) (EPA registrations as of 1992), and water soluble tablets containing 20% IBA which are made into a solution by the grower (U.S. registered Rhizopon-AA Water Soluble Tablets) (Blazich, 1988, Hartmann et al, 1990; Macdonald, 1986) IBA dissolved in water has proved to be more effective for rooting than IBA dissolved in alcohol, or the other auxins, indoleacetic acid (IAA) or
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