This study was conducted in Talkaif /Mosel Province (Medium rainfall 488mm/ year) during the winter season of 2012-2013 under zero tillage system (ZT) in wheat field (Triticumaestivum L.) to investigate the residues effects of Topikherbicide in plant growth stage and grain storage by using in weed control. The treatments consisting of post emergence of application doses of Topik (0 , 630cm3 , 800 cm3 , 960cm3) a.i./h with two application time (early and later application). The experimental design was R.C.B.D. factorial with three replicates.
The result showed that there was significant in residual herbicide attellering stage of wheat plant in early or late application of Topikwhich gave 275.46μg/g ( 6.59%) , 262.15μg/g(6.18%) respectively, but the herbicide residue was decreased at other growth stage of wheat plant which did not reach at lethal dose (2000μg/g ) even if it applied the herbicide at high dose. On other hand Topik was dis- appearing at harvesting stage (Z94) or at grain storage stages when it applied herbicide at late growth stage (April) while herbicide application at early stage (March) there was 13.16μg/g (0.094%) at harvesting time. Over all, the high doses of Topik sustain of residual in grain up to 0.08%. In general, herbicide residue dissipation during seed storage at temperature room especially when herbicide was applied at late time.