In two field experiments the effects of gibberellic acid, indoleacetic acid, naphthaleneacetic acid and B1 vitamin, were evaluated as growth regulators on cassava. Although the treatments used did not increase the root and stem yields significantly, gibberellic acid at 50ppm showed a tendency to increase root yields when the cassava cuttings were immersed instantaneously or during one hour, or when the 3-month old plants were sprayed.