The influence of propagation method and stand age on Miscanthus x giganteus performance in Iowa, USA

dc.contributor.advisor Emily A. Heaton Boersma, Nicholas
dc.contributor.department Agronomy 2018-08-11T14:10:48.000 2020-06-30T02:50:46Z 2020-06-30T02:50:46Z Tue Jan 01 00:00:00 UTC 2013 2015-07-30 2013-01-01
dc.description.abstract <p>Climate change and a desire for oil independency have stimulated interest in dedicated biomass crops for domestic biofuels production. <em>Miscanthus</em> × <em>giganteus</em> Greef et Deu., an exceptionally productive crop in the Midwestern USA, exhibits many ideal biomass crop traits, notably sterility which decreases invasive potential. Although a labor intensive process, rhizome propagation is the most common method for vegetatively propagating <em>M</em>. × <em>giganteus</em>. Stem propagation, investigated here, alleviates many challenges associated with rhizome production. Utilizing 30 °C soil and the first five nodal stem segments increased <em>M</em>. × <em>giganteus</em> propagation rates 12 fold of reported rhizome multiplication rates. Stem propagated plants (SPs) were field–tested at three sites in Iowa. I found that established SPs and rhizome propagated plants (RPs) yielded similarly, and averaged 24.7 Mg ha<sup>-1</sup>, similar to other Midwestern trials. Previous work showed that first–year <em>M</em>. × <em>giganteus</em> exhibited poor winter survival. In contrast, I found very high (> 99 %) first winter survival for both SPs and RPs. However, establishment losses for RPs and SPs were very high: 40 times greater than first winter losses. Winter survival was high in Iowa trials, but plants remained green until a killing frost; this observation is blamed for poor winter survival in early <em>M</em>. × <em>giganteus</em> trials. Here, the anecdotal assertion that first–year <em>M</em>. × <em>giganteus</em> exhibits minimal leaf senescence in the first autumn was supported quantitatively by photosynthetic and leaf N measurements. At the end of the first season, <em>M</em>. × <em>giganteus</em> exhibited photosynthetic rates, photosystem II efficiencies and leaf N up to 4, 4 and 2.4 times greater, respectively, than third–year plants, indicating delayed senescence.</p>
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dc.identifier archive/
dc.identifier.articleid 4595
dc.identifier.contextkey 5050429
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/13588
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 19:56:02 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Oil, Gas, and Energy
dc.subject.keywords Bioenergy crop
dc.subject.keywords Biomass
dc.subject.keywords Poaceae
dc.subject.keywords Rhizome
dc.subject.keywords Stem
dc.subject.keywords Yield
dc.title The influence of propagation method and stand age on Miscanthus x giganteus performance in Iowa, USA
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a dissertation Doctor of Philosophy
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