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Influence of cohorts on Chenopodium album demography

Published online by Cambridge University Press:  12 June 2017

Dawit Mulugeta  and
David E. Stoltenberg
Dawit Mulugeta
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI 53706
David E. Stoltenberg*
Affiliation:
Department of Agronomy, University of Wisconsin, Madison, WI
*
Corresponding author. destolte@facstaff.wisc.edu
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Abstract

Peak germination and emergence of common lambsquarters usually occur in early to mid-spring, but both processes can occur during summer and fall. Seeds produced by different common lambsquarters cohorts (seedlings that emerge at nearly the same time) may vary in dormancy status, response to environmental conditions, and response to management factors. Therefore, experiments were conducted to determine the influence of different cohorts on common lambsquarters demography. Field experiments determined plant density, biomass, and seed production of different common lambsquarters cohorts within a crop-free community of annual weed species that included redroot pigweed, giant foxtail, and velvetleaf. Common lambsquarters plant density and aboveground biomass were greater for a mid-May cohort than for early June, late June, mid-July, or early August cohorts, but seed production of the mid-May and early June cohorts did not differ (about 192,000 seeds m−2) and was greater than that of other cohorts (111,500 seeds m−2 or less). In the laboratory, percent germination prior to stratification (exposure of seeds to low temperatures) was less for seeds harvested from early May and late May cohorts (≥ 9%) than those of mid-June or early July cohorts (≤ 75%). After stratification in the field, percent emergence (seedlings per number of planted seeds) and mean emergence time were similar among early May, late May, mid-June, and early July cohort seed sources, and were not influenced by shallow burial in soil. These results suggest that recruitment from seeds produced by different common lambsquarters cohorts is similar, but proportional to the number of seeds produced by each cohort.

Keywords

Common lambsquarters, Chenopodium album L. CHEALgiant foxtail, Setaria faberi Herrm. SETFAredroot pigweed, Amaranthus retroflexus L. AMAREvelvetleaf, Abutilon theophrasti Medicus ABUTHSeed burialseedling emergenceseed germinationseed production
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 1 , February 1998 , pp. 65 - 70
Copyright
Copyright © 1998 by the Weed Science Society of America 

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