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Volunteer legume control in legume seed crops with carbon bands and herbicides 1. white clover trifolium repens


, : Volunteer legume control in legume seed crops with carbon bands and herbicides 1. white clover trifolium repens. Agronomy Journal 71(4): 665-670

Greenhouse and field experiments on T. repens L. were conducted in western Oregon [USA] to determine the potential of using activated C applied in bands over the seed row, with nonselective herbicides, to selectively control volunteer legumes. A 25-mm band of activated C was applied to the soil surface over the seeded row during planting and a nonselective herbicide was applied broadcast immediately. Weed control was visually evaluated, and stand and seed yield of the white clover was measured. The carbon:herbicide ratios required for protection with 0.5 kg/ha of diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea], atrazine [2-chloro 4-(ethylamino)-6-(isopropylamino)-s-triazine] and simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] were 50:1, 200:1, and 200:1, respectively. This reduction resulted in seed yields of 80, 40 and 14% of the check at 1st harvest of fall-planted white clover. Atrazine and simazine at 1.25 and 1.5 kg/ha, respectively, reduced seedling numbers to the same extent as diuron at 2 kg/ha. In the 2nd harvest of these treatments seed yields from plots established with diuron at 2 and 3 kg/ha were similar to those from the check plots. Seed yields from white clover established with C bands in the spring were not reduced by diuron. White clover injury was greatest when diuron was applied to soil that was wet on the surface. Seed germination and seed weight were not influenced by the herbicides used in these experiments. Weed control between the C bands was good but grasses and broadleaf weeds also were protected by the C band. With C banding, volunteer white clover and volunteer narrow birdsfoot trefoil (Lotus tenuis Waldst. and Kit) were both reduced 95% by diuron applied at 2 and 3.3 kg/ha. Individual circumstance will determine whether the increase in seed lot quality that results from the control of volunteer legumes will offset the reduction in the quantity of seed produced.

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