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Tractor Wheel Traffic Effects on Weed Emergence in Central Iowa

Published online by Cambridge University Press:  12 June 2017

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

The effects of tracking by tractor wheels on the emergence of common weed species of central Iowa were studied near Ames, IA, in 1996 and 1997. Seedling emergence in tracked and nontracked interrow areas, soil water content, and soil temperature were monitored for 8 to 10 wk after planting of soybean (Glycine max). Compared to nontracked interrow areas, a single wheel-tracking pass at crop planting increased the cumulative number of seedlings of giant (Setaria faberi) and yellow foxtails (S. glauca) by 187%, common waterhemp (Amaranthus rudis) by 102%, and common lambsquarters (Chenopodium album) by 30%. There was little effect of wheel traffic on velvetleaf (Abutilon theophrasti) emergence. After planting, soil water content to a depth of 5 cm was higher in tracked areas than in nontracked areas, but after 6 wk there was no difference. Soil temperature at 4- to 5-cm depth was similar in tracked and nontracked interrows. Compaction from wheel traffic apparently did not create a physical impediment to emergence; rather, it altered micro-environmental conditions in ways that stimulated weed germination and emergence.

Keywords

Common lambsquarters, Chenopodium album L. ♯ CHEALcommon waterhemp, Amaranthus rudis Sauer ♯ AMATAgiant foxtail, Setaria faberi Herrm. ♯ SETFAvelvetleaf, Abutilon theophrasti Medic. ♯ ABUTHyellow foxtail, Setaria glauca (L). Beauv. ♯ SETLUsoybean, Glycine max (L.) Merr.Soil compactionSetaria spp.ABUTHAMATACHEALSETFASETLUNT, nontracked interrowWT, wheel-tracked interrows
Type
Research
Information
Weed Technology , Volume 13 , Issue 4 , December 1999 , pp. 741 - 746
Copyright
Copyright © 1999 by the Weed Science Society of America 

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