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Time of Removal of Crownbeard (Verbesina encelioides) on Peanut Yield

Published online by Cambridge University Press:  20 January 2017

Rodney L. Farris ,
Cody J. Gray ,
Don S. Murray  and
Laval M. Verhalen
Rodney L. Farris
Affiliation:
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
Cody J. Gray
Affiliation:
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
Don S. Murray*
Affiliation:
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
Laval M. Verhalen
Affiliation:
Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078
*
Corresponding author's E-mail: dmurray@okstate.edu
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Abstract

Field experiments were conducted in southwestern Oklahoma near Colony in 2000 and near Ft. Cobb in 2001 to quantify the effect of time of removal of a natural population of crownbeard on peanut yield. Weed densities and dry weed weights were measured at eight weed-removal times, and in-shell peanut yields were determined at harvest. Crownbeard was removed at 0 (the weed-free check), 4, 6, 8, 10, 12, 14, and 16 wk (full season) after crop emergence (WAE). Weed density was a poor predictor for dry weed weight and peanut yield; however, dry weed weight and time of removal were good predictors for peanut yield. Weed growth was minimal up to 4 WAE and increased linearly after that time. For each week of weed growth, a 0.52 kg/plot increase in dry weed weight was measured. Peanut yield decreased linearly because of crownbeard competition. For each kilogram per plot increase in dry weed weight, a 129 kg/ha or 5.1% peanut yield reduction took place. For each week of weed interference, a 75 kg/ha or 2.8% peanut yield reduction occurred. Crownbeard removal by or before 4 WAE will minimize losses in peanut yield because of interference.

Keywords

Crownbeard, Verbesina encelioides (Cav.) Benth. & Hook. f. ex Gray # VEEENpeanut, Arachis hypogaea L.Competitioncompetitive durationdry weed weightinterferenceweed densityyieldANOVA, analyses of varianceWAE, weeks after crop emergence
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 2 , June 2005 , pp. 380 - 384
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Published with the approval of the Director, Oklahoma Agricultural Experiment Station, Oklahoma State University.
Current address: Research Associate I, Plant and Soil Sciences Department, P.O. Box 9555, Mississippi State, MS 39762.

References

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