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Integration of cover crops with postemergence herbicides in no-till corn and soybean

Published online by Cambridge University Press:  20 January 2017

Robert S. Gallagher ,
John Cardina  and
Mark Loux
John Cardina
Affiliation:
Department of Horticulture and Crop Science, The Ohio State University, Wooster, OH 44691
Mark Loux
Affiliation:
Department of Horticulture and Crop Science, The Ohio State University, Columbus, OH 43210
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Abstract

The integration of cover crops with selected postemergence herbicides was evaluated on the basis of weed control and grain yields in no-till soybean and corn. Soybean was planted into wheat residue, whereas corn was planted into hairy vetch residue. Full, half, and quarter rates and sequential herbicide applications were made. The wheat cover crop did not increase weed suppression but increased soybean grain yields. Half rates of thifensulfuron plus quizalofop-P as single or split applications were as effective as full rates in reducing weed weight in soybean. Soybean grain yields were similar in the half- and full-rate treatments in 1994, but yield was highest in the full-rate treatment in 1995. The hairy vetch cover crop did not increase weed suppression but lowered corn stands and grain yields in 1995 and enhanced corn grain yields in 1996. Full, half, and quarter rates (1996 only) of nicosulfuron plus primisulfuron were equally effective in reducing weed weight. Corn grain yields were similar at all herbicide rates in 1995 but were inversely related to herbicide rate in 1996. Split herbicide applications did not improve weed suppression over single applications of the same herbicide rate in either crop. Results indicate that cover crops can improve crop productivity and reduced rates of environmentally benign herbicides can minimize the herbicide requirements in no-till corn and soybean.

Keywords

Glyphosatenicosulfuronprimisulfronquizalofop-Pthifensulfuroncorn, Zea mays L.hairy vetch, Vicia villosa Rothsoybean, Glycine max L.wheat, Triticum aestivum L.Conservation tillagewater qualityintegrated crop managementweed controlcover cropsreduced herbicide ratessplit applications
Type
Weed Management
Information
Weed Science , Volume 51 , Issue 6 , December 2003 , pp. 995 - 1001
Copyright
Copyright © Weed Science Society of America 

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