Where's the nitrogen? The timing and impacts of internal nitrogen cycling on switchgrass (Panicum virgatum L.) yield and biofuel quality

dc.contributor.advisor Emily Heaton
dc.contributor.author Wilson, Danielle
dc.contributor.department Agronomy
dc.date 2018-08-11T10:48:09.000
dc.date.accessioned 2020-06-30T02:43:14Z
dc.date.available 2020-06-30T02:43:14Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2012
dc.date.embargo 2013-05-02
dc.date.issued 2012-01-01
dc.description.abstract <p>Research focused on dedicated bioenergy crops that can be used to meet our advanced biofuels goal, i.e., made from non-food sources like agricultural residues and lignocellulosic feedstocks, has found switchgrass (Panicum virgatum L.) to be a leading candidate species. Switchgrass requires nitrogen (N) in greater quantities, compared to other nutrients, for plant biomass production, but high N concentration ([N]) is undesirable in the harvested biomass feedstock for two reasons: 1) it is economically and environmentally expensive to replace N removed from cropping system and 2) N reduces the conversion efficiency of biomass to biofuels via thermochemical conversion. Immediate reductions in the [N] of the harvested portions of perennial feedstocks, including switchgrass, can be achieved by exploiting seasonal internal N cycling. The biology of switchgrass provides some opportunity to naturally manipulate the [N] of this biomass feedstock, but there is a trade-off between the quantity and quality of the feedstock depending on the time of harvest. The research objectives of this project were to: 1) elucidate the spatial and temporal distribution of N in above- and below-ground tissues of field-grown switchgrass to determine its impacts on yield and N removal and 2) determine how switchgrass harvest date influences biofuel quality from fast pyrolysis. We recommend harvesting post-frost switchgrass biomass for improved long-term yields and reduced [N] in the harvested portions of biomass that can result in reduced N removal. This will benefit both biomass producers and also thermochemical facilities who will receive low-N biomass to reduce conversion costs.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/12518/
dc.identifier.articleid 3525
dc.identifier.contextkey 3437887
dc.identifier.doi https://doi.org/10.31274/etd-180810-2449
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/12518
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/26707
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/12518/Wilson_iastate_0097M_12577.pdf|||Fri Jan 14 19:23:41 UTC 2022
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Oil, Gas, and Energy
dc.subject.keywords bioenergy
dc.subject.keywords biomass crop
dc.subject.keywords bio-oil
dc.subject.keywords thermochemical conversion
dc.title Where's the nitrogen? The timing and impacts of internal nitrogen cycling on switchgrass (Panicum virgatum L.) yield and biofuel quality
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
thesis.degree.level thesis
thesis.degree.name Master of Science
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