عنوان مقاله [English]
Greenhouse experiments were conducted to investigate the effect of spray adjuvant on reducing carrier water salts on glyphosate and herbicidal mixture2,4,-D+MCPA performance on licorice(Glycyrrhiza glabra L.) in experimental greenhouse of University ofTehran,Karaj in 2010. The effect of adjuvant urea ammonium nitrate (UAN), Diammonium sulfate (AMS), Ammonium thiosulfate (ATS) and Ethylene diamine tetra acetate (EDTA) in Offsetting antagonistic effects of two concentrations (0.01 and 0.1 M) of Clacium (Ca) and Magnesium (Mg) were evaluated in two separate experiments using various doses of glyphosate and herbicidal mixture2,4-D+MCPA. In both experiments, treatments were laid out in a completely randomized design in a factorial arrangement with four replications. Results of this study showed that both ions decreased herbicide performance but Ca ion was more efficient than Mg in reducing the activity of used herbicide. Generally, adding adjutants into spray tank increased efficacy of herbicide and its effects on herbicide performance depended on both spray carrier salts and dose of used herbicide. ATS showed the lowest ability in reducing adverse effects of present salts in spray carrier on performance of the examined herbicides while UAN and AMSwere the most effective adjuvant in enhancing the efficacy of glyphosate and herbicidal mixture 2,4-D+MCPA on licorice. According to the results of this study it could be concluded that ammonium-containing adjuvant, in addition to their chelating properties, increased herbicide absorption. Results of this study demonstrated that licorice tissues may act as a source of antagonistic ions for used herbicide.