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Effects of shading on common waterhemp (Amaranthus rudis) growth and development

Published online by Cambridge University Press:  20 January 2017

Lawrence E. Steckel ,
Christy L. Sprague ,
Aaron G. Hager ,
F. William Simmons  and
German A. Bollero
Lawrence E. Steckel
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
Aaron G. Hager
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
F. William Simmons
Affiliation:
Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801
German A. Bollero
Affiliation:
Department of Crop Sciences, University of Illinois, Urbana, IL 61801
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Abstract

Common waterhemp is a significant weed problem in Midwestern cropping systems partly because of its potential for multiple emergence events during the growing season. The effects of shade and time of emergence on this weed have not been characterized. In the field, common waterhemp vegetative and reproductive growth were evaluated under different irradiance levels at two emergence times. In full sunlight a common waterhemp plant emerging in late May produced 720 g of biomass and over one million seeds, and a plant emerging in late June produced 350 g of biomass and over 730,000 seeds. Plant biomass and seed production were lower as irradiance levels were decreased to 40, 68, and 99% shade. Mortality was high for common waterhemp grown in 99% shade; however, surviving plants produced some viable seed. Common waterhemp plants grown under reduced irradiance had higher leaf area ratios and lower relative growth rates.

Keywords

Common waterhemp, Amaranthus rudis Sauer AMATADelayed emergenceirradianceshadeseed production
Type
Weed Biology and Ecology
Information
Weed Science , Volume 51 , Issue 6 , December 2003 , pp. 898 - 903
Copyright
Copyright © Weed Science Society of America 

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