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Effect of Russian Thistle (Salsola iberica) Interference on Spring Wheat (Triticum aestivum)

Published online by Cambridge University Press:  12 June 2017

Frank L. Young
Frank L. Young*
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., 215 Johnson Hall, Washington State Univ., Pullman, WA 99164
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Abstract

The effect of Russian thistle density and duration of interference on spring wheat was investigated in two 3-yr field studies. In the density study, the best fit regression equation predicted a loss in spring wheat yield of 0.5, 0.5, and 0.6% in 1983, 1984, and 1985, respectively, for each percent of the total biomass contributed by Russian thistle. In 1985, when rainfall was 46% below normal, the highest weed density produced greater than 70% of the total plant biomass and reduced yields more than 50%. In contrast, in 1984 when rainfall was 65% above normal, the highest weed density produced less than 20% of the total plant biomass and reduced yields 11%. In the duration study, the predicted yield loss was 2.3 and 0.7% for 1983 and 1984, respectively, for each week of interference. In 1985, yield was not significantly reduced until after 6 weeks of interference. In both studies, spikes/m of row had the highest correlation with yield and were affected the most by weed interference.

Keywords

Russian thistle, Salsola iberica Sennen and Pau #3 SASKRspring wheat, Triticum aestivum L. ‘Dirkwin’Competitiongrain yieldweed biomassyield componentsSASKR
Type
Weed Biology and Ecology
Information
Weed Science , Volume 36 , Issue 5 , September 1988 , pp. 594 - 598
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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