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The Interaction of Soybean (Glycine max) and Five Weed Species in the Greenhouse

Published online by Cambridge University Press:  12 June 2017

Janet L. Shurtleff  and
Harold D. Coble
Janet L. Shurtleff
Affiliation:
American Cyanamid Co., Plant Ind. Div., Princeton, NJ 08540
Harold D. Coble
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27695–7627
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Abstract

The influence of relative planting date on the growth of common cocklebur (Xanthium pensylvanicum Wallr. ♯ XANST), common ragweed (Ambrosia artemesiifolia L. ♯ AMBEL), sicklepod (Cassia obtusifolia L. ♯ CASOB), and redroot pigweed (Amaranthus retroflexus L. ♯ AMARE) grown in competition with soybean [Glycine max (L.) Merr. ‘Bragg’] was studied in the greenhouse. Increases in dry matter and height were slower for the five weed species than for soybean throughout the period of the study. The root: shoot ratio of soybean was the highest of any plant in the study, while common ragweed, common cocklebur, common lambsquarters, and sicklepod were intermediate, and redroot pigweed was the lowest. Soybean dry weight was always reduced when grown in competition with a weed. Soybean dry-matter production was reduced most when weeds were planted 2 weeks before soybean, especially with common cocklebur and common lambsquarters. Weed dry-matter content was severely reduced when the weed seed were planted simultaneously with or following soybean. Soybean height was usually reduced by competition with the weeds. The height of common ragweed was increased, however, when planted simultaneously with soybean. Common lambsquarters, redroot pigweed, and common ragweed heights were increased when planted 2 weeks prior to soybean.

Keywords

Weed competitionplanting dateXanthium pensylvanicumChenopodium albumAmbrosia artemesiifoliaCassia obtusifoliaAmaranthus retroflexusXANSTCHEALAMBELCASOBAMARE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 33 , Issue 5 , September 1985 , pp. 669 - 672
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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