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Responses of spreading orach (Atriplex patula) and common lambsquarters (Chenopodium album) to soil compaction, drought, and waterlogging

Published online by Cambridge University Press:  20 January 2017

Manjula Maganti ,
Susan Weaver  and
Michael Downs
Manjula Maganti
Affiliation:
Agriculture and Agri-Food Canada, Harrow, ON N0R 1G0, Canada
Michael Downs
Affiliation:
Agriculture and Agri-Food Canada, Harrow, ON N0R 1G0, Canada
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Abstract

Root traits and growth of spreading orach and common lambsquarters were compared in response to soil compaction, drought, and waterlogging under controlled environment conditions. On the basis of the typical habitats occupied, the hypothesis was that spreading orach would be more tolerant of compaction and waterlogging and common lambsquarters more tolerant of drought. When grown in buckets with two soil bulk densities (1.2 and 1.6 g cm−3) for 8 wk, the two species responded similarly to compaction, with the fraction of fine roots reduced by 10%, total root length by 70%, root and shoot dry weight and leaf area by 50 to 60%, and plant height by 30% at the high compared with the low bulk density. When grown for 6 wk in soil columns 1 m long, which were watered daily or allowed to dry, common lambsquarters was deeper rooted than spreading orach at both moisture levels and better able to sustain growth in the drying columns. The watering regime did not alter the rooting depth of either species. Total root length in successive 10-cm increments declined exponentially from the top to the bottom of the watered columns, but root proliferation was reduced in the upper 20 cm of the drying columns. The average root diameter of both species decreased with drought and increased with soil compaction. When grown in waterlogged soil at 10 or 20 C for 4 wk, seedlings of spreading orach survived with little reduction in growth, whereas survival and growth of common lambsquarters were drastically reduced, particularly under cool soil conditions.

Keywords

Common lambsquarters, Chenopodium album L. CHEALspreading orach, Atriplex patula L. ATXPARoot lengthroot diametertraitweed
Type
Weed Biology and Ecology
Information
Weed Science , Volume 53 , Issue 1 , February 2005 , pp. 90 - 96
Copyright
Copyright © Weed Science Society of America 

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