An efficient strategy of enhancing herbicide performance with adjuvant application
Mehdizadeh, M. (Mohagheh Ardabili Univ. of Ardabil (Iran). Dept. of Agronomy and Plant Breeding) | Darbandi, E.I. (Ferdowsi Univ. of Mashhad (Iran). Faculty of Agriculture)
A greenhouse study was conducted in the Department of Agronomy and Plant Breeding, Mohaghega Ardabili, University of Ardabil, Iran during 2012 to determine the efficacy of 3 adjuvants (citogate, castor oil and canola oil) at concentrations of 0, 0.1 and 0.2 (%v/v) with mixture of metsulfuron methyl and sulfosulfuron (Total) herbicide @ 4, 10, 20, 30 and 40 g. a.i to control little seed canary grass (Phalaris minor Ritz.). Results showed that all adjuvants enhanced the efficacy of Total in decreasing the dry weights of little seed canary grass. Performance of herbicide increased with enhancing their concentrations against the tested plant. Measured ED50 and ED90 doses of Total alone based on little seed canary grass dry weight were 17.61 and 34.27 g a.i./ha, respectively. Whereas values for citogate 0.2 (%v/v), were 6.03 and 14.27 g a.i/ha, respectively. The addition of citogate and canola oil had the highest and lowest effect on Total° efficacy against little seed canary grass, respectively, supporting the idea that this adjuvant solubilizes the cuticular waxes thus facilitating herbicide uptake.
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