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Kochia (Kochia scoparia) Interference in Sunflower (Helianthus annuus)

Published online by Cambridge University Press:  12 June 2017

Beverly R. Durgan ,
Alan G. Dexter  and
Stephen D. Miller
Beverly R. Durgan
Affiliation:
N.D. State Univ., Fargo, ND 58105
Alan G. Dexter
Affiliation:
N.D. State Univ., Fargo, ND 58105
Stephen D. Miller
Affiliation:
N.D. State Univ., Fargo, ND 58105
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Abstract

Field experiments were conducted in 1983 and 1984 at two locations to determine the influence of various densities and durations of kochia interference in sunflower. Sunflower achene yield and dry weight were reduced by all densities of kochia, averaged over locations and years. Season-long competition by kochia densities of 0.3, 1, 3, and 6 plants/m of row decreased sunflower achene yield 7, 10, 20, and 27%, respectively. Sunflower achene yield and sunflower dry weight decreased as weeks of kochia competition increased. Only 2 weeks of kochia competition after sunflower emergence decreased sunflower achene yield 6%. Sunflower achene yield loss increased as the duration of kochia competition increased. Sunflower 200 achene weight, oil content, and plant height were not influenced by various densities or durations of kochia competition.

Keywords

Kochia, Kochia scoparia (L.)Schrad. ♯3 KCHSCsunflower, Helianthus annuus L. var. ‘Seed Tech Hybrid 315’DensitydurationinterferenceKCHSC
Type
Research
Information
Weed Technology , Volume 4 , Issue 1 , March 1990 , pp. 52 - 56
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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