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Interference of Certain Broadleaf Weed Species in Soybeans (Glycine max)

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

Field experiments were conducted in 1979, 1980, and 1981 to determine the level of interference five broadleaf weed species exert on soybean [Glycine max (L.) Merr.]. Weed species studied were common cocklebur (Xanthium pensylvanicum Wallr. ♯ XANST), common ragweed (Ambrosia artemesiifolia L. ♯ AMBEL), common lambsquarters (Chenopodium album L. ♯ CHEAL), sicklepod (Cassia obtusifolia L. ♯ CASOB), and redroot pigweed (Amaranthus retroflexus L. ♯ AMARE). The following soybean seed yield reductions were observed with a density of 16 weeds/10-m row: redroot pigweed 22%, common lambsquarters 15%, common ragweed 12%, and sicklepod 5%, respectively. At a density of 8 weeds/10-m row, common cocklebur reduced soybean yield 11%. No single weed growth parameter predicted soybean seed yield reduction for all weed species. Soybean height was reduced by sicklepod competition; was not affected by competition from common lambsquarters, common ragweed, or common cocklebur; and was increased in the presence of redroot pigweed at 12 weeks after planting, when measured 30 cm from the weeds. Leaf area of soybean was higher at greater distances from the weed for all weed species. The range of soybean leaf area reductions occasioned by proximity to individual weed species corresponded fairly well with differences in soybean yield reduction.

Keywords

Weed competitioneconomic thresholdsXanthium pensylvanicumAmbrosia artemesiifoliaChenopodium albumCassia obtusifoliaAmaranthus retroflexusXANSTAMBELCHEALCASOBAMARE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 33 , Issue 5 , September 1985 , pp. 654 - 657
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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