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Reduced-Herbicide Weed Management Systems for No-Tillage Corn (Zea mays) in a Hairy Vetch (Vicia villosa) Cover Crop

Published online by Cambridge University Press:  12 June 2017

John R. Teasdale
John R. Teasdale*
Affiliation:
Weed Sci. Lab., U. S. Dep. Agric, Agric. Res. Serv., Beltsville, MD 20705
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Abstract

Weed management treatments with various degrees of herbicide inputs were applied with or without a hairy vetch cover crop to no-tillage corn in four field experiments at Beltsville, MD. A hairy vetch living mulch in the no-treatment control or a dead mulch in the mowed treatment improved weed control during the first 6 wk of the season but weed control deteriorated in these treatments thereafter. Competition from weeds and/or uncontrolled vetch in these treatments without herbicides reduced corn yield in three of four years by an average of 46% compared with a standard PRE herbicide treatment of 0.6 kg ai/ha of paraquat plus 1.1 kg ai/ha of atrazine plus 2.2 kg ai/ha of metolachlor. Reducing atrazine and metolachlor to one-fourth the rate of the standard treatment in the absence of cover crop reduced weed control in three of four years and corn yield in two of four years compared with the standard treatment. Hairy vetch had little influence on weed control or corn yield with any herbicide treatments.

Keywords

Atrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diaminemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamideparaquat, 1,1′-dimethyl-4,4′-bipyridinium ioncorn, Zea mays L.hairy vetch, Vicia villosa Roth # VICVISustainable agricultureatrazinedicambametolachlornicosulfuronparaquatVICVI
Type
Research
Information
Weed Technology , Volume 7 , Issue 4 , December 1993 , pp. 879 - 883
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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