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Giant Green Foxtail (Setaria viridis var. major) and Fall Panicum (Panicum dichotomiflorum) Competition in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Thomas C. Harris  and
Ronald L. Ritter
Thomas C. Harris
Affiliation:
Agron. Dep., Univ. Maryland, College Park, MD 20742
Ronald L. Ritter
Affiliation:
Agron. Dep., Univ. Maryland, College Park, MD 20742
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Abstract

Effects of a natural mixed stand of giant green foxtail [Setaria viridis var. major (Gaudin) Pospichel # SETVM] and fall panicum [Panicum dichotomiflorum Michx. # PANDI] on soybean [Glycine max (L.) Merr. ‘Union’ and ‘Essex′] biomass and seed yield were investigated during 1981, 1982, and 1983. Plots maintained weed free for 2 weeks after soybean emergence produced yields equal to those maintained weed free for the season despite any grass reinfestation. Grasses growing naturally with soybeans for 8 weeks after soybean emergence did not reduce crop yields. Weeds not removed after 8 weeks reduced soybean yields by decreasing the number of pods per plant. Under drought conditions, yield reduction due to grass competition did not occur until 12 to 16 weeks after soybean emergence. Hand-established densities of 1 grass plant/7.5 cm of crop row reduced soybean yield by 0 to 11%. Natural grass infestations reduced soybean yield by 21 to 41%.

Keywords

Interferenceweed densitySETVMPANDI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 35 , Issue 5 , September 1987 , pp. 663 - 668
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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