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Fertilizer and Population Affects Nitrogen Assimilation of Common Lambsquarters (Chenopodium album) and Redroot Pigweed (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: [email protected]
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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 N assimilation by weeds is necessary to maximize economic return. Total plant yield is generally independent of population density, except when plants are very small or at very low population density. If plant yield is independent of population density, weed N assimilation may also be independent of population density. However, the effect of weed population density on N assimilation has not been thoroughly investigated. A 2011 controlled-environment study was established in East Lansing, MI, to evaluate the effect of weed population density and N application rate on growth and N assimilation by common lambsquarters and redroot pigweed. Study factors included four weed densities (1, 2, 4, and 8 plants pot−1), three N application rates (0, 67, and 134 kg N ha−1), and two weed species (redroot pigweed and common lambsquarters). Weeds were destructively harvested 3 wk after emergence, and shoot height, biomass, total N concentration, N use efficiency, and N assimilation were measured. Redroot pigweed was taller, had greater shoot biomass, and a greater shoot N assimilation than did common lambsquarters. With similar environmental conditions, redroot pigweed is expected to be more competitive than common lambsquarters. Shoot N assimilation increased with increasing weed population density, indicating that N assimilation was not independent of population density 3 wk after emergence because weeds were 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
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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