Show simple item record

dc.contributor.authorBayer, Amanda Leigh
dc.date.accessioned2015-06-05T04:30:16Z
dc.date.available2015-06-05T04:30:16Z
dc.date.issued2014-12
dc.identifier.otherbayer_amanda_l_201412_phd
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/bayer_amanda_l_201412_phd
dc.identifier.urihttp://hdl.handle.net/10724/31384
dc.description.abstractImproving water and nutrient management is a focus of sustainable container plant production. Best management practices are commonly used and although effective, these methods do not take into account actual plant water needs. Irrigating in response to substrate volumetric water content applies only the water needed by the crop to replace what is lost to evapotranspiration and plant water use. Soil moisture sensor technology can allow for precise and efficient control of irrigation in response to substrate water content. To best utilize this technology an understanding of the effect of irrigation volume and water stress on plant growth is needed. The aim of this research was to understand how plant growth is affected by substrate water content and irrigation volume. Hibiscus acetosella and Gardenia jasminoides were irrigated using an automated irrigation systems set to maintain substrate volumetric water content above various thresholds in order to quantify plant growth and irrigation volume. Experiments were conducted in Watkinsville and Tifton, GA in order to assess differences due to environmental conditions. Growth of Hibiscus acetosella increased with increasing volumetric water content threshold, with plants above the 0.35 m3∙m-3 threshold of a salable size, which suggests that moderate irrigation volumes can be used in plant production. Growth of two Gardenia jasminoides cultivars responded similarly to volumetric water content threshold. Bud and bloom development was greater at the 0.40 m3∙m-3 threshold than the 0.50 m3∙m-3 threshold indicating that over-irrigation can impact bud and bloom development. Plant growth of Gardenia jasminoides was similar when grown with 50% and 100% of the standard bag rate of a controlled release fertilizer indicating that reduced fertilizer applications can be possible with more efficient irrigation. Efficient irrigation also reduced leachate volume. There were diurnal patterns of stem elongation of Hibiscus acetosella for both well-watered and water-stressed plants with elongation rates greatest after the onset of darkness. Further research with additional species will provide additional information in order to most effectively utilize sensor controlled irrigation and reduced fertilizer applications in a commercial plant production.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectautomated irrigation
dc.subjectsoil moisture sensor
dc.subjectdatalogger
dc.subjectwoody ornamental plants
dc.subjectvolumetric water content
dc.subjectnursery production
dc.subjectelectrical conductivity
dc.subjectleaching
dc.subjectfertilization
dc.subjectevapotranspiration
dc.subjectstem elongation
dc.subjectload cell
dc.subjectheight control
dc.subjectcircadian rhythms
dc.subjectdiurnal growth pattern
dc.titleImproving growth and quality of Hibiscus acetosella and Qardenia jasminides with efficient irrigation and fertilization for more sustainable container plant production
dc.typeDissertation
dc.description.degreePhD
dc.description.departmentHorticulture
dc.description.majorHorticulture
dc.description.advisorJohn Ruter
dc.description.advisorMarc Van Iersel
dc.description.committeeJohn Ruter
dc.description.committeeMarc Van Iersel
dc.description.committeeSheryl Wells
dc.description.committeeRobert O. Teskey
dc.description.committeeMatthew Chappell


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record