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Effect of volunteer potato density on bulb onion yield and quality

Published online by Cambridge University Press:  20 January 2017

Martin M. Williams II ,
Corey V. Ransom  and
W. Mack Thompson
Corey V. Ransom
Affiliation:
Malheur Experiment Station, Oregon State University, 595 Onion Avenue, Ontario, OR 97914
W. Mack Thompson
Affiliation:
University of Idaho Research and Extension Center, 29603 U of I Lane, Parma, ID 83660
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Abstract

Bulb onions are poor competitors and volunteer potato, commonly observed in western USA onion fields, is difficult to manage. To improve the understanding of onion and weed interactions, relationships were quantified among volunteer potato density, onion yield, and volunteer potato tuber production using hyperbolic or linear models. Onion yield losses because of volunteer potato interference occur at densities commonly observed in the field. A volunteer potato density as low as 0.067 plants m−2 resulted in a 10% reduction in crop yield. Asymptotic yield loss (A parameter) was 100% and achieved with 4 volunteer potato plants m−2. Volunteer potato competition limits onion bulb size, resulting in a lower quality and thus a less-valuable crop. Volunteer potato tuber density and biomass increased linearly with initial weed density as high as 8 volunteer potato m−2. Onion yield loss from volunteer potato competition occurs to a greater extent and at a lower weed density than demonstrated in previous research on small-seeded annual weed species.

Keywords

Volunteer potato, Solanum tuberosum L. ‘Russet Burbank’ and ‘Ranger Russet’onion, Allium cepa L. ‘Pinnacle’ and ‘Vaquero’Competitioneconomic thresholdhyperbolic modelweed densityyield loss
Type
Weed Biology and Ecology
Information
Weed Science , Volume 52 , Issue 5 , October 2004 , pp. 754 - 758
Copyright
Copyright © Weed Science Society of America 

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