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Microtopography, Microenvironments, and Weed Populations in Ridge-Tilled Soybean

Published online by Cambridge University Press:  20 January 2017

Thomas W. Jurik
Thomas W. Jurik*
Affiliation:
Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011
*
Corresponding author's E-mail: jurik@iastate.edu
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Abstract

The effects of microtopographic position on soil microenvironment and weed populations in ridge-tilled soybean were evaluated on three farms in Iowa in 1989 and 1990. In both years, over all weed species (primarily giant foxtail, green foxtail, yellow foxtail, redroot pigweed, and Pennsylvania smartweed), seedling emergence was highest in late May and early June, with few seedlings emerging after mid-June. Weed populations were highest in May and early June, after which rotary hoeing and cultivation reduced weed numbers in all plots. Microtopographic position (row, shoulder, and furrow) had a large effect on soil microenvironment and weed populations. Furrows were the wettest position through most of the growing season. Rows were the warmest position early in the season and the coolest position late in the season. Cumulative weed emergence early in the season was closely related to growing degree days, which accumulated faster in the row position than the furrow position. Following rotary hoeing and cultivation, the row position had significantly more total weeds than the shoulder and furrow positions on all farms in August of both years.

Keywords

Giant foxtail, Setaria faberi Herrm. #3 SETFAgreen foxtail, Setaria viridis (L.) Beauv. # SETVIPennsylvania smartweed, Polygonum pensylvanicum # POLPYredroot pigweed, Amaranthus retroflexus L. # AMAREyellow foxtail, Setaria glauca (L.) Beauv # SETLUsoybean, Glycine max (L.) MerrConservation tillagemechanical weed controlseedling emergenceweed densityweed population dynamicsGDDgrowing degree days

Information

Type
Research Article
Information
Weed Technology , Volume 20 , Issue 3 , September 2006, pp. 593 - 604
Copyright
Copyright © Weed Science Society of America 

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