Compatibility of reed canarygrass with alfalfa and birdsfoot trefoil

dc.contributor.author Jones, Thomas
dc.contributor.department Agronomy
dc.date 2018-08-17T12:33:42.000
dc.date.accessioned 2020-07-02T06:04:40Z
dc.date.available 2020-07-02T06:04:40Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 1986
dc.date.issued 1986
dc.description.abstract <p>Perennial grass-legume mixtures are an important component of the hectareage harvested for hay and by grazing ruminants in the U.S.A. An ideal perennial grass-legume mixture has an intermediate botanical composition, but competitive exclusion of one component by the other is a common problem. Our objectives were to (1) characterize competitive relationships between reed canarygrass (Phalaris arundinacea L.) and alfalfa (Medicago sativa L.) and birdsfoot trefoil (Lotus corniculatus L.) in binary reed canarygrass-legume mixture, (2) describe mechanisms of competition displayed by these species, and (3) define traits amenable to selection which could improve legume compatibility of reed canarygrass. Both legumes dominated reed canarygrass following an initial establishment period. Niche divergence, apparent in reed canarygrass-birdsfoot trefoil mixtures, was responsible for their stability relative to reed canarygrass-alfalfa mixtures, which did not exhibit niche divergence. At early harvests, when competitive forces were rapidly changing botanical composition, legumes were taller and more mature in mixture than in monoculture, resulting in increased shading of reed canarygrass. Height and early maturity of reed canarygrass genotypes were associated with competitiveness against legumes. Tiller density, the more important reed canarygrass yield component in our study, exhibited a greater competitive effect against legumes than tiller weight. Mechanisms of competition changed over time. Increased height and advanced maturity of legumes in mixture relative to monoculture were present only at early harvests. Likewise, residual variation for legume dry-matter yield (DMY) among mixtures with 14 reed canarygrass clones, beyond that explained by the clones' mixture reed canarygrass DMY, was important only at early harvests. Both at early harvests, when reed canarygrass dominated, and at late harvests, when legumes dominated, suppression (defined as DMY reduction of a given component per unit DMY of its competitor) of the dominant component exceeded suppression of the dominated component. Selection for high DMY, height, early maturity, and low rhizomatous spreading ability should improve legume compatibility of reed canarygrass.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/8087/
dc.identifier.articleid 9086
dc.identifier.contextkey 6328972
dc.identifier.doi https://doi.org/10.31274/rtd-180813-5779
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/8087
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/81036
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/8087/r_8627122.pdf|||Sat Jan 15 02:06:22 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.keywords Agronomy
dc.subject.keywords Plant breeding and cytogenetics
dc.title Compatibility of reed canarygrass with alfalfa and birdsfoot trefoil
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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