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Common Sunflower (Helianthus annuus) Interference in Onions (Allium cepa)

Published online by Cambridge University Press:  12 June 2017

Robert M. Menges  and
Simon Tamez
Robert M. Menges
Affiliation:
Sci. Ed. Admin., U.S. Dep. Agric., Weslaco, TX 78596
Simon Tamez
Affiliation:
Sci. Ed. Admin., U.S. Dep. Agric., Weslaco, TX 78596
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Abstract

Common sunflower (Helianthus annuus L.) interference in onions (Allium cepa L. ‘Yellow Granex PRR’) was studied at different weed densities and periods of interference. Onion yields were reduced when the highest density (360/m2) of common sunflower interference with onions from 6 weeks after emergence and when sunflower at densities of 50/m2 and 5/m2 interfered for 12 and 15 weeks after emergence, respectively. Yield was not reduced if the crop was kept weed-free for 2 to 12 weeks after emergence with the shortest weed-free periods of 2 and 6 weeks requiring high light irradiance and high soil temperature and intermediate soil moisture. Climatic factors were more useful than weed density in explaining differential interference of sunflower in onions. Onion yield was negatively linearly correlated (P<0.05) with sunflower fresh weight, but was not linearly correlated with sunflower height.

Keywords

Integrated pest managementcompetitionPARsoil temperaturesoil moisture
Type
Research Article
Information
Weed Science , Volume 29 , Issue 6 , November 1981 , pp. 641 - 647
Copyright
Copyright © 1981 by the Weed Science Society of America 

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References

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