Although the PGR are not intended to directly influence seedyields, in some cases the productivity is favored because less photo-synthates are allocated to stem vertical growth, plant architecturebecome more adequate for light capturing, or problems with pestsand diseases are diminished (Nuti et al., 2006; Dodds et al., 2010). Inthis experiment, the PGRs were more efficient for increasing seedyield than for reducing vertical growth (Table 1).