Bragt, J. van Effects of gibberellic acid, 6-benzylaminopurine, a-naphthaleneacetic acid and ethephon on growth and flowering of tulip bulbs cv. "Apeldoorn" and their bulblets J. van Bragt and H. van Gelder - Acta Horticulturae . Subjects--Index Terms: Sustancias de crecimiento vegetal Horticultura