Evaluation of nitrogen source, phosphorus rate and mixing depth for growth and establishment of Poa pratensis L. on sand-based systems

dc.contributor.advisor David M. Minner
dc.contributor.author Lee, Sang-Kook
dc.contributor.department Horticulture
dc.date 2018-08-22T21:50:02.000
dc.date.accessioned 2020-06-30T07:59:16Z
dc.date.available 2020-06-30T07:59:16Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 2003
dc.date.embargo 2017-08-29
dc.date.issued 2003-01-01
dc.description.abstract <p>Nitrogen is a component of the proteins, enzymes, amino acids, and many other biochemicals in plants required to maintain color and density of grasses and for the restoration of healthy conditions following environmental stress. Phosphorus is an important element ofthe phospholipids that help form the plant cell membranes. The suitable formation of these membranes is dependent on a readily available source ofP to the plant. Mobility and availability of nutrients varies with several factors such as application frequency, placement in the soil, and the amount of irrigation or precipitation, especially in sand-based systems. Frequent applications ofN are used to reduce N loss by leaching because N may be easily leached from a sand-based system. Use of slow-release N sources has been promoted as a more efficient N fertilizer strategy. Phosphorus mobility and availability varies with several factors such as application frequency, placement in the soil, and the amount of irrigation or precipitation. The objectives of this study were to compare urea and methylene urea rate at 146 and 293 kg N•ha-1 at four mixing depths (0, 7.6, 15.2, and 22.9 em) in a sand-based system (Chapter. 2) and to evaluate Prate at 146 and 293 kg P•ha-1 at four mixing depths (0, 7.6, 15.2, and 22.9 em) in a sand-based system (Chapter. 3). Grass clipping samples were collected every two weeks, dried, and weighed. Root dry weight and root organic matter weight also were evaluated at the end of the study. Leachate was collected weekly and analyzed for nitrate-nitrogen (N03-N) and P concentrations. Split applications of urea on the surface produced the largest clipping yield and the best NUE for total mass yield, with the lowest N03-N loss due to leaching. Methylene urea at the 22.9 em mixing depth resulted in more grass growth, smaller N03-N losses, and better NUE for total mass than urea placed below the surface. Grass treated with 293 kg P·ha-1 produced 2-30% more Pin the tissue than treatments of 146 kg P·ha-1 , with the exception of the application at the 15.2 em mixing depth. No difference was found between applications made to the surface and those at the 7.6 em mixing depth. Surface application with 146 and 293 kg P·ha- 1 produced 8-10% and 16-20% more P in tissue than subsurface applications, respectively.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/17346/
dc.identifier.articleid 18355
dc.identifier.contextkey 10678384
dc.identifier.doi https://doi.org/10.31274/rtd-180813-8131
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/17346
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/71149
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/17346/ISU_2003_L437.pdf|||Fri Jan 14 21:21:00 UTC 2022
dc.subject.disciplines Horticulture
dc.title Evaluation of nitrogen source, phosphorus rate and mixing depth for growth and establishment of Poa pratensis L. on sand-based systems
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication df043cd4-424c-49f5-8685-318972aae642
thesis.degree.discipline Horticulture
thesis.degree.level thesis
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