EN
Field experiments were carried out in 200–2009 at the Research Station of Department of Agronomy in Chylice. The objective of the study was the effectiveness of growth regulator BAS 12 208 W, used alone and with ammonium sulphate and retardant Cycocel 750 SL. Growth regulators were applied at 2 node of winter barley (BBCH 32) and at 3–4 node of spring barley (BBCH 33–34) in different doses. The best retardant effect was observed for BAS 12 208 W + Cycocel 750 SL in spring barley and for BAS 12 208 W + ammonium sulphate at the highest dose in winter barley. In field experiments barley logging was not recorded, and the yield value was comparable in all experimental objects.