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Control of 5 broadleaf weeds in sugar beets beta vulgaris with glyphosate



Control of 5 broadleaf weeds in sugar beets beta vulgaris with glyphosate



Weed Science 30(3): 291-296



Field experiments were conducted to study the feasibility of applying glyphosate [N-(phosphonomethyl)glycine] postemergence with a recirculating sprayer and a vertical roller for the control of common lambsquarters (Chenopodium album L.), common sunflower (Helianthus annuus L.), kochia [Kochia scoparia (L.) Schrad.], redroot pigweed (Amaranthus retroflexus L.) and velvetleaf (Abutilon theophrasti Medic.) in sugarbeets (B. vulgaris L.). Glyphosate was applied twice each year at 1.7 kg/ha with a recirculating sprayer in 1977 and 1978, or twice as a 20% (vol/vol) solution with a vertical-roller applicator in 1979. By harvest, 70-74% of the total population of treated common sunflower, kochia, and redroot pigweed, 61% of the common lambsquarters and 30% of the velvetleaf were dead. Root yields in glyphosate-treated plots, when average over 3 yr, were increased 5800, 8500, 12,500 and 13,400 kg/ha at densities of 6, 12, 18 and 24 broadleaf weeds (equal densities of common lambsquarters, kochia, and redroot pigweed)/30 m of row, respectively. Where equal densities of common sunflower and velvetleaf competed with sugarbeets, root yields in glyphosate-treated plots, when averaged over 2 yr, were increased 4400, 11,900, 11,700 and 10,700 kg/ha, respectively, at these same densities.

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