Grozi Delchev Trakia University, Faculty of Agriculture, Stara Zagora

The aim of this investigation was to establish the changes of sowing properties of durum wheat seeds and the quantity of waste grain due to the influence of 20 antibroadleaved herbicides, which were applied during the 1st, the 2nd, and the 3rd stem node stages of durum wheat. During the 1st stem node stage of durum wheat none of the herbicides included in the investigation had negative effect on sowing characteristics of durum wheat seeds. During the 2nd and the 3rd stem node stages of durum wheat herbicides such as Arat, Biathlon, Derby super, Mustang, Secator, Lintur, Akurat, and Akurat extra can be used in seed production crops of durum wheat. During the 1st stem node stage of durum wheat the antibroadleaved herbicides Arat, Biathlon, Derby super, Mustang, Weedmaster, Secator, Lintur, Akurat, Akurat extra, Eagle, Starane, Sanafen, Dicotex, and Herby can be used. These herbicides do not have negative influence on grain yield. During the 2nd stem node stage of durum wheat the herbicides Arat, Biathlon, Derby super, Mustang, Secator, Lintur, Akurat, Akurat extra, Starane, Dicotex, and Herby can be used. During the 3rd stem node stage of durum wheat only the herbicides Arat, Biathlon, Derby super, Secator, Lintur, Akurat, Akurat extra, and Starane can be used.