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Effects of CO2 Enrichment on Competition Between a C4 Weed and a C3 Crop

Published online by Cambridge University Press:  12 June 2017

David T. Patterson ,
Elizabeth P. Flint  and
Jan L. Beyers
David T. Patterson
Affiliation:
Dep. Bot., Duke Univ., Durham, NC 27706
Elizabeth P. Flint
Affiliation:
Dep. Bot., Duke Univ., Durham, NC 27706
Jan L. Beyers
Affiliation:
Dep. Bot., Duke Univ., Durham, NC 27706
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Abstract

The C4 weed johnsongrass [Sorghum halepense (L.) Pers. ♯3 SORHA] and the C3 crop soybean [Glycine max (L.) Merr. ‘Ransom’] were grown separately and in inter- and intraspecific competition at 350 and 675 ppm CO2 in controlled environment chambers with 29/23 C day/night temperatures and 950 μE·m-2 · s-1 PPFD (photosynthetic photon flux density). In the absence of competition, the higher CO2 concentration stimulated dry matter accumulation, leaf area expansion, net assimilation rate, and leaf area duration of soybean more than that of johnsongrass. The plant relative yield (PRY) of soybean in competition with johnsongrass increased, and the PRY of johnsongrass in competition with soybean decreased, as the CO2 concentration was increased from 350 to 675 ppm. Thus, the competitiveness of the C3 crop with the C4 weed increased with increasing CO2 concentration. Relative yield totals were not significantly different from 1.0, indicating that the two species were competing for the same resources. With the increases in global atmospheric CO2 concentration predicted for the next 50 to 100 yr, the competitiveness of C3 crops with C4 weeds could be increased.

Keywords

Glycine maxSorghum halepensegrowth analysisbiomass partitioningSORHA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 32 , Issue 1 , January 1984 , pp. 101 - 105
Copyright
Copyright © 1984 by the Weed Science Society of America 

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References

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