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Wild Oat (Avena fatua) and Spring Barley (Hordeum vulgare) Density Affect Spring Barley Grain Yield

Published online by Cambridge University Press:  12 June 2017

Richard M. Evans ,
Donald C. Thill ,
Lawrence Tapia ,
Bahman Shafii  and
Joan M. Lish
Richard M. Evans
Affiliation:
Dep. Plant, Soil, Entomol. Sci., Univ. Idaho, Moscow, ID 83843
Donald C. Thill
Affiliation:
Dep. Plant, Soil, Entomol. Sci., Univ. Idaho, Moscow, ID 83843
Lawrence Tapia
Affiliation:
Dep. Plant, Soil, Entomol. Sci., Univ. Idaho, Moscow, ID 83843
Bahman Shafii
Affiliation:
Dep. Plant, Soil, Entomol. Sci., Univ. Idaho, Moscow, ID 83843
Joan M. Lish
Affiliation:
Dep. Plant, Soil, Entomol. Sci., Univ. Idaho, Moscow, ID 83843
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Abstract

Addition series field experiments were conducted near Moscow, ID, in 1987 and 1988 to determine the relative aggressiveness of spring barley and wild oat and to determine the effect of barley and wild oat density and proportion on barley grain yield and wild oat seed rain. Regression analysis was used to describe the relationship of the aboveground biomass and grain yield to species density. Barley was more aggressive than wild oat. Barley biomass was affected most by intraspecific competition, while wild oat biomass was affected most by interspecific competition. Barley aggressiveness changed little throughout the growing season. Wild oat aggressiveness varied but was always less than barley aggressiveness. Increasing wild oat density had a negative, asymptotic-type effect on barley grain yield at all barley densities. However, the effect of wild oat was greatest at the lower density of barley. Increasing barley density decreased wild oat seed rain.

Keywords

Spring barley, Hordeum vulgare L. ‘Steptoe’wild oat, Avena fatua L. ♯ AVEFAInterferencerelative aggressivenesswild oat seed rainaddition series designAVEFA
Type
Research
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 33 - 39
Copyright
Copyright © 1990 by the Weed Science Society of America 

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