Citation
Teo, Kee Chiong
(1997)
Effect of Organosilicone Surfactant on Uptake and Translocation of Glyphosate in Pennisetum Polystachion L.
Masters thesis, Universiti Putra Malaysia.
Abstract
The effect of adding organosilicone surfactant, Pulse® on efficacy, uptake and
translocation of glyphosate (Roundup®) for the control of Pennisetum polystachion was
evaluated in the glasshouse. The dose-response study with glyphosate on 9-week old
P. polystachion showed that at the rate of 1.08 kg a.e.iha, glyphosate caused complete
mortality of the plants. It was estimated that dosage between 360 to 540 g a.e./ha gave
50% mortality.
When Pulse® was added to the glyphosate spray solutions, the bioefficacy of
glyphosate on P. polystachion increased as the concentration of Pulse® increased. The
optimum concentration ofPulse® was 0.2 % w/w above which no significant increase in
the bioefficacy was observed. Spray deposition studies using tlourescent tracer technique
revealed that the mixture of glyphosate and Pulse® gave 42% higher spray deposition
compared to glyphosate alone, thus contributing to the increase in bioefficacy of
glyphosate observed in the mixture.
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