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Published online 25 April 2006
Published in Crop Sci 46:1354-1359 (2006)
© 2006 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Elevated Atmospheric Carbon Dioxide and Weed Populations in Glyphosate Treated Soybean

Lewis H. Ziska* and Ernie W. Goins

Crop Systems and Global Change Laboratory, USDA, Agricultural Research Service, Building 1, Room 323, 10300 Baltimore Avenue, Beltsville, MD 20705


Figure 1
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  		Fig. 1. Quantification of above ground weed biomass in three general categories, (C3 broadleaf, C4 broadleaf and C4 grass) when grown at ambient and elevated (+250 µmol mol–1) [CO2] in Round-up Ready soybean without glyphosate application in 2004. Variation for a given weed category was tested by a one-way ANOVA, with three replicates. *, P < 0.05; **, P < 0.01; ***, P < 0.001.

 

Figure 2
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  		Fig. 2. Soybean seed yield (g m–2) as a function of increasing weed biomass at either ambient (solid line) or elevated (ambient +250 µmol mol–1, dashed line) CO2 for 2003 and 2004. No differences in the slope of the regression as a function of [CO2] were observed (ANCOVA).

 

Figure 3
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  		Fig. 3. Quantification of above ground weed biomass in three general categories, (C3 broadleaf, C4 broadleaf and C4 grass) when grown at ambient and elevated (+250 µmol mol–1) [CO2] in Round-up Ready soybean, but after application of recommended amounts of glyphosate (Round-up). Note that significant amounts of C3 broadleaf weeds were still present at the elevated CO2 treatment after glyphosate application. Variation for a given weed category was tested by a one-way ANOVA, with three replicates. *, P < 0.05; **, P < 0.01; ***, P < 0.001.

 




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