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Competitive Effects of Wild Oat in Flax

Published online by Cambridge University Press:  12 June 2017

Allyn R. Bell  and
John D. Nalewaja
Allyn R. Bell
Affiliation:
Department of Agronomy
John D. Nalewaja
Affiliation:
Department of Agronomy
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Abstract

Wild oat (Avena fatua L.) competition severely reduced flaxseed (Linum usitatissimum L.) yield. Averaged over two locations and two fertility levels, 80 wild oat plants/sq yd reduced the yield 9.4 bu/A (60.1%) in 1964 and 160 wild oat plants/sq yd reduced the yield 21.5 bu/A (82.1%) in 1965. At Fargo, 160 wild oat plants/sq yd reduced flaxseed yield 16.1 bu/A (86.1%) in 1966. Flaxseed yield components, including bolls/sq ft, seeds/boll, plants/sq ft, and weight/1000 flaxseed were determined. Although all components were reduced by wild oat competition, a reduction in the number of branches and flax bolls/sq ft accounted for 90.7% of the yield loss. A reduction in weight/1000 seed and the number of flax plants/sq ft contributed 7.0% and 4.6% to the yield loss, respectively. Competition from wild oat also reduced flaxseed quality. The percent oil was reduced in all 3 years of the experiment. Iodine number of the oil was reduced, primarily because of an increase in oleic acid and a decrease in linolenic acid.

Type
Research Article
Information
Weed Science , Volume 16 , Issue 4 , October 1968 , pp. 501 - 504
Copyright
Copyright © Weed Science Society of America 

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References

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