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Fertilizer and Population Affects Nitrogen Assimilation ofCommon Lambsquarters (Chenopodium album) and RedrootPigweed (Amaranthus retroflexus)

Published online by Cambridge University Press:  20 January 2017

Laura E. Lindsey ,
Darryl D. Warncke ,
Kurt Steinke  and
Wesley J. Everman
Laura E. Lindsey*
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
Darryl D. Warncke
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
Kurt Steinke
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
Wesley J. Everman
Affiliation:
Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695
*
Corresponding author's E-mail: lindsey.233@osu.edu
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Abstract

Weed growth and N assimilation usually increase with N application rate.With the increasing price of N fertilizer, a better understanding Nassimilation by weeds is necessary to maximize economic return. Total plantyield is generally independent of population density, except when plants arevery small or at very low population density. If plant yield is independentof population density, weed N assimilation may also be independent ofpopulation density. However, the effect of weed population density on Nassimilation has not been thoroughly investigated. A 2011controlled-environment study was established in East Lansing, MI, toevaluate the effect of weed population density and N application rate ongrowth and N assimilation by common lambsquarters and redroot pigweed. Studyfactors included four weed densities (1, 2, 4, and 8 plantspot−1), three N application rates (0, 67, and 134 kg N ha−1), and two weed species (redroot pigweed and commonlambsquarters). Weeds were destructively harvested 3 wk after emergence, andshoot height, biomass, total N concentration, N use efficiency, and Nassimilation were measured. Redroot pigweed was taller, had greater shootbiomass, and a greater shoot N assimilation than did common lambsquarters.With similar environmental conditions, redroot pigweed is expected to bemore competitive than common lambsquarters. Shoot N assimilation increasedwith increasing weed population density, indicating that N assimilation wasnot independent of population density 3 wk after emergence because weedswere small or at low population density.

Keywords

Common lambsquarters, Chenopodium album L. CHEALredroot pigweed, Amaranthus retroflexus L. AMAREC3 : C4 plant metabolismintraspecific weed competitionnitrogen concentrationroot : shoot

Information

Type
Weed Biology and Ecology
Information
Weed Science , Volume 61 , Issue 1 , March 2013 , pp. 131 - 135
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Department of Horticulture and Crop Science, Ohio State University, 2021 Coffey Road, Columbus, OH 43210.

References

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