Used as a synthetic auxin in agriculture to promote root development in plant cuttings, especially in vegetative propagation of ornamental and fruit plants. Commonly applied in rooting powders and solutions to enhance the formation of adventitious roots. Also used to prevent premature fruit drop, improve fruit set, and control fruit thinning in orchards. Applied in tissue culture for plant growth regulation and callus induction. Its stability and effectiveness make it a preferred choice over natural auxins in commercial horticulture.