Abstract
There is lack of information on the yield and yield component performance of same-row and alternate-row mixtures (SRM and ARM) of widely contrasting barley (Hordeum vulgare L.) phenotypes. Therefore, four phenotypically contrasting spring barley cultivars, each selected to represent a unique combination of spike type (two-row or six-row), height (short or tall) and days to maturity (early or late) were used in 1991 and 1992 in field experiments at the Elora Research Station in Ontario, Canada, with the objective of determining whether a yield and/or yield-component advantage could be associated with same-row or alternate-row mixtures of barley cultivars. The four cultivars chosen for the study were each grown as monocrops, and in all six possible binary (two-cultivar) mixture combinations as same-row or alternate-row mixtures, in a randomized complete block design. A 13% yield increase of early, short:late, tall SRM over the midcomponent (weighted mean of the components grown in monocrop) yield in 1991, and 14% yield increase of early, tall:late, tall SRM over the midcomponent yield in 1992 was observed. Between the 2 yr, cultivars in ARM produced similar or significantly greater yields than the monocrop yields, except in 1991, when the late, short cultivar in ARM with early, tall cultivar produced significantly lower yields than in monocrop. The spike number m –2 was similar for all mixtures and their midcomponents, except in 1992, when early, short:late, short in ARM produced 7.0% more spikes than the midcomponent. The results of this study indicate a possible yield advantage of phenotypically contrasting barley mixtures compared to monocrops, with early, short:late, tall and early, tall:late, tall in same-row mixtures having the best combining abilities. Key words: Barley, phenotypes; mixture, same row; mixture, alternate-row; maturity; height
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Claims 8
Claim · model-written summary
Early, short:late, tall same-row mixture yielded 13% more than the midcomponent in 1991.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- early, short:late, tall SRMe1
- Outcome
- yielde1
- Direction
- increasee1
- Value
- 13%e1
- Comparator
- midcomponent (weighted mean of the components grown in monocrop)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“A 13% yield increase of early, short:late, tall SRM over the midcomponent (weighted mean of the components grown in monocrop) yield in 1991”
t0“Mixture performance of phenotypically contrasting barley cultivars”
Claim · model-written summary
Early, tall:late, tall same-row mixture yielded 14% more than the midcomponent in 1992.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- early, tall:late, tall SRMe1
- Outcome
- yielde1
- Direction
- increasee1
- Value
- 14%e1
- Comparator
- midcomponente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“14% yield increase of early, tall:late, tall SRM over the midcomponent yield in 1992”
t0“Mixture performance of phenotypically contrasting barley cultivars”
Claim · model-written summary
Alternate-row mixtures yielded similar or significantly greater than their monocrops in 1991 and 1992, except one mixture.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- cultivars in ARMe1
- Outcome
- yieldse1
- Direction
- similar or significantly greatere1
- Comparator
- monocrope1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Between the 2 yr, cultivars in ARM produced similar or significantly greater yields than the monocrop yields”
t0“Mixture performance of phenotypically contrasting barley cultivars”
Claim · model-written summary
Late, short cultivar in alternate-row mixture with early, tall cultivar yielded significantly lower than monocrop in 1991.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- late, short cultivar in ARM with early, tall cultivare1
- Outcome
- yieldse1
- Direction
- lowere1
- Comparator
- monocrope1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“except in 1991, when the late, short cultivar in ARM with early, tall cultivar produced significantly lower yields than in monocrop”
t0“Mixture performance of phenotypically contrasting barley cultivars”
Claim · model-written summary
Spike number was similar for all mixtures and their midcomponents.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- mixturese1
- Outcome
- spike numbere1
- Direction
- similare1
- Comparator
- midcomponentse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The spike number m –2 was similar for all mixtures and their midcomponents”
t0“Mixture performance of phenotypically contrasting barley cultivars”
Claim · model-written summary
Early, short:late, short alternate-row mixture produced 7.0% more spikes than the midcomponent in 1992.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- early, short:late, short in ARMe1
- Outcome
- spikese1
- Direction
- moree1
- Value
- 7.0%e1
- Comparator
- midcomponente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“except in 1992, when early, short:late, short in ARM produced 7.0% more spikes than the midcomponent”
t0“Mixture performance of phenotypically contrasting barley cultivars”
Claim · model-written summary
Same-row mixtures of early, short:late, tall and early, tall:late, tall cultivars had the best combining abilities.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- same-row mixturese1
- Outcome
- combining abilitiese1
- Direction
- beste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with early, short:late, tall and early, tall:late, tall in same-row mixtures having the best combining abilities”
t0“Mixture performance of phenotypically contrasting barley cultivars”
Claim · model-written summary
Phenotypically contrasting barley mixtures may give a yield advantage over monocrops.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- phenotypically contrasting barley mixturese1
- Outcome
- yield advantagee1
- Comparator
- monocropse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The results of this study indicate a possible yield advantage of phenotypically contrasting barley mixtures compared to monocrops”
t0“Mixture performance of phenotypically contrasting barley cultivars”