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Bristly Starbur (Acanthospermum hispidum) Interference in Peanuts (Arachis hypogaea)

Published online by Cambridge University Press:  12 June 2017

Robert H. Walker ,
Larry W. Wells  and
John A. McGuire
Robert H. Walker
Affiliation:
Dep. Agron. and Soils
Larry W. Wells
Affiliation:
Dep. Agron. and Soils
John A. McGuire
Affiliation:
Alabama Agric. Exp. Stn., Auburn Univ., AL 36849
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Abstract

The effects of bristly starbur interference with peanuts were studied from 1980 through 1983 on a Dothan sandy loam (Plinthic Paleudults). Peanut seed yields, which included kernels plus hulls, were reduced as bristly starbur densities increased from 2 to 64 plants/7.5 m of row. Full-season interference from 8, 16, 32, and 64 bristly starbur plants/7.5 m of row reduced peanut seed yields 14, 26, 43, and 50%, respectively. The seed yield of peanuts maintained weed free for 6 weeks after crop emergence was reduced by no more than 3% compared to peanuts maintained weed free for the entire season. Weed interference for 2 weeks after crop emergence reduced seed yield by an average of 4% over the 3-yr period, based on prediction equations. Bristly starbur interference for 13 weeks after crop emergence reduced peanut forage dry weight yield by 54%. Similarly, peanut interference for 13 weeks after emergence reduced bristly starbur forage dry weight yield by 32%. Bristly starbur density in the forage dry weight studies averaged 35/7.5 m of row. These bristly starbur were confined to a 35-cm band over the drill. Peanut density averaged 72/7.5 m of drill.

Keywords

Bristly starbur, Acanthospermum hispidum DC. ♯3 ACNHIpeanuts, Arachis hypogea L.CompetitiondensitiesthresholdsACNHI

Information

Type
Weed Biology and Ecology
Information
Weed Science , Volume 37 , Issue 2 , March 1989 , pp. 196 - 200
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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