EFFECT OF HERBICIDES APPLIED IN DIFFERENT GROWTH STAGES ON HECTOLITER WEIGHT OF BARLEY

Three barley varieties (Rex, NS 293 and Egej), treated with six herbicides (2,4-D, MCPP+dicamba, triasulfuron+dicamba, 2,4-D+florasulam, amidosulfuron+iodosulfuron and florasulam+flumetsulam) were included in this experiment. Herbicides were applied during the three different growth stages tillering (BBCH 24-27), first node (BBCH 31) and second node (BBCH 32). The aim of this experiment was to consider the influence of herbicides (applied in different growth stages) on barley hectoliter weight. In first and third experimental years herbicides did not significantly influence barley seed hectoliter weight. In second experimental year at Rex variety in first and second node stage MCPP+dicamba significantly increase barley hectoliter weight compared with weed free control. In second node stages 2,4-D and florasulam+flumetsulam also increase barley hectoliter weight compared with weed free control. At NS 293 in tillering stage MCPP+dicamba significantly decrease barley hectoliter weight compared with weed free control. Also at Egej variety triasulfuron+dicamba at first node stage was also significantly decrease barley hectoliter weight compared with weed free control. Differences between growth stages during the herbicide applications in all three years of testing were very small, so they have no impact on barley hectoliter weight. If conditions do not allow herbicides to be used in the optimal period, it can be used until second node stage, without having a negative impact on the barley hectoliter weight