In this study, the PGR were applied as a one-time dose, at a spe-cific development stage. However, multiple applications along thephase of intensive plant growth (before the onset of the reproduc-tive growth) is an effective strategy adopted in cotton (Dodds et al.,2010) that allows flexibility in the dose to be applied and someadjustments at late stages in the cases that early applications failedto control plant growth.