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Weed Seedling Emergence and Survival as Affected by Crop Canopy

Published online by Cambridge University Press:  20 January 2017

Randy L. Anderson
Randy L. Anderson*
Affiliation:
USDA-ARS, 2923 Medary Avenue, Brookings, SD 57006
*
E-mail: randy.anderson@ars.usda.gov.
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Abstract

This study measured impact of cool-season crops on seedling emergence, survival, and seed production of weeds common in corn and soybean. Weed dynamics were monitored in permanently marked quadrats in winter wheat, spring wheat, and canola. Three species, green foxtail, yellow foxtail, and common lambsquarters, comprised more than 80% of the weeds observed in the study. Seedling emergence was reduced by winter wheat, but not by spring wheat or canola, when compared with adjacent quadrats without a crop canopy. Approximately 10% of seedlings in spring wheat and canola developed into seed-bearing plants, but no seed-bearing plants were present in winter wheat at harvest. Common lambsquarters produced more than 1,100 seeds/plant, whereas a foxtail plant produced 85 seeds, averaged across spring wheat and canola. At harvest, new seedlings were present in all crops; thus, control after harvest will be required to prevent seed production in the fall. Winter wheat may provide an opportunity to disrupt population dynamics of weeds common in corn and soybean without requiring herbicides.

Keywords

Common lambsquarters, Chenopodium album L.green foxtail, Setaria viridis (L.) Beauvyellow foxtail, Setaria glauca (L.) Beauvcanola, Brassica napus L.corn, Zea mays L.soybean, Glycine max (L.) Merrwheat, Triticum aestivum L.Population dynamicsseed-bearing plantsweed seed production
Type
Weed Biology and Competition
Information
Weed Technology , Volume 22 , Issue 4 , December 2008 , pp. 736 - 740
Copyright
Copyright © Weed Science Society of America 

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