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Emergence Pattern of Five Weeds in the Central Great Plains

Published online by Cambridge University Press:  12 June 2017

R. L. Anderson  and
D. C. Nielsen
R. L. Anderson
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Akron, CO 80720
D. C. Nielsen
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Akron, CO 80720
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Abstract

Seedling emergence was characterized for five weeds that infest summer annual crops in the central Great Plains as affected by crop canopy or tillage. The study was established in winter wheat stubble between 1987 and 1990, with seedling emergence recorded weekly between April 1 and November 1. Kochia emerged primarily from early April to late June, whereas green foxtail, wild-proso millet, and redroot pigweed began emerging in late May and continued until August. Volunteer wheat emerged throughout the growing season. Tillage did not affect the emergence pattern of any species, but the numbers of kochia, volunteer wheat, and green foxtail seedlings were increased in no-till. Conversely, wild-proso millet emergence was greater with tillage. Only volunteer wheat's emergence was affected by crop canopy, as fall emergence of volunteer wheat was more than three times greater in corn than in proso millet.

Keywords

Green foxtail, Setaria viridis (L.) Beauv. # SETVIkochia, Kochia scoparia (L.) Schrad. # KCHSCredroot pigweed, Amaranthus retroflexus L. # AMAREvolunteer wheat, Triticum aestivum L.wild-proso millet, Panicum miliaceum L. # PANMIcorn, Zea mays L.Crop canopytemperature windowtillagewinter annual grassesAMAREKCHSCPANMISETVI

Information

Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 744 - 749
Copyright
Copyright © 1996 by the Weed Science Society of America 

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