PJB-2019-940
Effects of graminicides on grassy weeds control in sugar beet (Beta vulgaris L.)
mozhgan veisi
Abstract
Grassy weeds cause serious problems in sugar beet fields and reduce yields. In order to investigate efficacy of the new herbicide quizalofop- p- tefuryl (@pantera- 40EC) in sugarbeet field, an experiment was carried out in kermanshah. The experiment was conducted in a randomized complete block design with 8 treatments and 4 replications. Treatments consisted of quizalofop- p- tefuryl at 1, 1.5 and 2 L.ha-1, setoxidium at 3 L.ha-1, haloxyfop-r-methyl at 1 L.ha-1, propaquizafop at 1.5 L.ha-1, quizalofop-p-ethyl at 2 L.ha-1 and two hand weeding. Herbicides were used at the 4 to 6 leaf stage of grassy weeds. Results showed that the highest total dry weight reduction of weeds was obtained with quizalofop- p- tefuryl at 1.5 and 2 L.ha-1 followed by haloxyfop-r-methyl at 81%, 99% and 78.3% respectively in competition with untreated control. While the least effects on total dry weight of weeds were observed with application of propaquizafop, setoxidium, quizalofop- p- tefuryl at 1 and quizalofop-p-ethyl at 38.8%, 50%, 52% and 43.9% respectively. Furthermore the apllication of quizalofop- p- tefuryl at 2 L.ha-1 and hand weeding as well as haloxyfop-r-methyl and quizalofop-p-ethyl increased fresh weight of sugar beet root 32.4%, 32, 30 and 29.2% respectively. Generally, quizalofop- p- tefuryl at 2 L.ha-1 was the most suitable herbicide for control of weeds and increased yield of sugar beet.
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