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Interference of Redroot Pigweed (Amaranthus retroflexus) and Robust Foxtail (Setaria viridis var. robusta-alba or var. robusta-purpurea) in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

P. L. Orwick  and
M. M. Schreiber
P. L. Orwick
Affiliation:
Agric. Res. Sci. Ed. Admin., U.S. Dep. Agric. and Prof. Weed Sci., Purdue Univ., West Lafayette, IN 47907
M. M. Schreiber
Affiliation:
Agric. Res. Sci. Ed. Admin., U.S. Dep. Agric. and Prof. Weed Sci., Purdue Univ., West Lafayette, IN 47907
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Abstract

Redroot pigweed (Amaranthus retroflexus L.) and robust foxtail [Setaria viridis (L.) Beauv. var. robusta-alba Schreiber (RWF) or Setaria viridis var. robusta-purpurea Schreiber (RPF)] were investigated regarding their ability to interfere with soybean [Glycine max (L.) Merr. ‘Amsoy 71′] at different weed densities and soybean row spacing throughout two growing seasons. Final weed densities for each species tended to reach a common value because of intraspecific interference regardless of the initial density. With cultivation, a narrow soybean row spacing (38 cm) resulted in less weed growth than did a wide row spacing (76 cm) but with no cultivation, the trend was reversed. Soybeans provided less interference to foxtail than to pigweed during both growing seasons. Interference from foxtail adversely affected soybean yield components and soybean seed yield more than did pigweed interference. Water-stress conditions in 1976 increased the intensity of weed interference and reduced soybean seed yield more severely than in 1975 when moisture was adequate throughout the growing season.

Keywords

Weed densityrow spacingLAIsoybean yield componentsweed competition
Type
Research Article
Information
Weed Science , Volume 27 , Issue 6 , November 1979 , pp. 665 - 674
Copyright
Copyright © 1979 by the Weed Science Society of America 

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