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Regeneration of Canada Thistle (Cirsium arvense) from Intact Roots and Root Fragments at Different Soil Depths

Published online by Cambridge University Press:  20 January 2017

Mette Goul Thomsen ,
Lars-Olav Brandsæter  and
Haldor Fykse
Mette Goul Thomsen*
Affiliation:
Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, N-1432, Ås, Norway Department of Agricultural Sciences, Hedmark University College, Blæstad, Norway Norwegian Institute for Agricultural and Environmental Research (Bioforsk), N-1432, Ås, Norway
Lars-Olav Brandsæter
Affiliation:
Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, N-1432, Ås, Norway Norwegian Institute for Agricultural and Environmental Research (Bioforsk), N-1432, Ås, Norway
Haldor Fykse
Affiliation:
Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, N-1432, Ås, Norway
*
Corresponding author's E-mail: mette.thomsen@bioforsk.no
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Abstract

In the present field study, the capability of Canada thistle to develop shoots from intact roots and root fragments at different soil depths was studied. The experiments were performed on four sites with high-density Canada thistle, with three or four replications per treatment. At each site, the soil in the plots was removed layer by layer (to 30 or 40 cm, depending on the site), within a 1 by 1-m quadrat, and spread out on a plastic sheet. All roots and other plant parts were removed, and the soil was either replaced without any root material (two sites), or the roots of the thistles were cut into 10-cm-long fragments and replaced into the source holes (two sites). The measured variables were shoot number and biomass. The number of shoots of Canada thistle decreased with increasing depth (P < 0.001) and increased with time. Additionally, the two factors interacted (P < 0.001) such that shoot development was slower from greater depths. Roots from ≤ 20 cm depth produced higher biomasses than did roots from below 20 cm depth. Replacement of root fragments did not affect the amount of biomass produced. It was concluded that the intact root system contributed considerably more to the total biomass produced by Canada thistle than did the root fragments in the upper soil layers.

Keywords

Canada thistle, Cirsium arvense (L.) ScopIntact root systemshoot biomass
Type
Weed Biology and Ecology
Information
Weed Science , Volume 61 , Issue 2 , June 2013 , pp. 277 - 282
Copyright
Copyright © Weed Science Society of America 

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