Texas, USA 2010 - International Herbage Seed Group

Significant differences were recorded in the number of seed in inflorescence (see. Figure 1). Atthe most grass species the number of the seed was higher at treated grasses; however, at the somespecies then number of the seed was lower in consequence with higher number of fertile stems.Positive influence of trinexapac-ethyl application on increase of number of perennial ryegrassseed was observed by Silberstein et al. (2002), who found out that TE increases number ofcreated ripe seed, while potential number of seed isn't impressed with. Application TE so haspositively effect on Floret site utilization (FSU). According to Young et al. (2007) the nitrogenrate increasing has significant effect on increasing of both, actual and potential seed number, butinsignificant effect on FSU in perennial ryegrass.Reduction in plant height and lodging was recorded on all the treated plots. Application oftrinexapac-ethyl on cool season grass seed crops can significant increases seed yields mainly dueto number of seed increasing. There is slight variation in the increasing of seed yield betweengrass species, but average increasing of seed yield is about 12-15 %. Based on trials the PGRModdus (trinexapac-ethyl 250 g l -1 ) at 0.8 l ha -1 preferably applied at growth stage GS 31-32 or0.4 l ha -1 applied 2 times (GS 29 and GS 32) has been allowed for minor use in seed crops ofeach grass species under study in the Czech Republic.201