Volunteer Legume Control in Legume Seed Crops with Carbon Bands and Herbicides. II. Red Clover and Alfalfa1
- M. Philip Rolston,
- W. Orvid Lee and
- Arnold P. Appleby2
Volunteer legumes from seed in the soil may contaminate seed lots of red clover (Trifolium pratense L.) and alfalfa (Medicago sativa L.). No herbicides are available to selectively control these volunteers. Experiments were conducted in western Oregon to determine the potential of using activated carbon applied in 25-mm bands over the seed row during planting to protect the crop from nonselective herbicides applied to control volunteer legumes. Control of volunteer legumes was estimated visually, and white clover stand and seed yields were measured. Greenhouse and field experiments democstrated that both red clover and alfalfa can be established with carbon bands and diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea]. Tolerance of red clover to diuron varied with the season of establishment; the greatest injury occurred when diuron was applied in the fall to soils that were wet on the surface. Seed yields for red clover established with carbon bands and 0, 2, and 4 kg/ha diuron averaged 566, 560, and 348 kg/ha, respectively, across all treatments. Seed yield for the two legumes established in 30, 50, and 80-cm row widths were: alfalfa, 264, 354, and 424 kg/ha, respectively; and red clover, 635, 584, and 376, respectively. In the greenhouse, EPTC (S-ethyl dipropylthiocarbamate) granules at 10 mg/m of row applied as a mixture with the alfalfa seed, controlled perennial ryegrass (Lolium perenne L.) in the carbon band without reducing the number or weight of the alfalfa seedlings. Atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] or diuron at 1 and 3 kg/ha, respectively, controlled 85 to 99% of red clover volunteers.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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