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dc.contributor.authorZhai, Hao
dc.date.accessioned2020-09-07T03:53:02Z
dc.date.available2020-09-07T03:53:02Z
dc.date.issued2020
dc.identifier.urihttps://hdl.handle.net/10182/12612
dc.description.abstractAbstract withheld due to embargo restrictionsen
dc.language.isoenen
dc.publisherLincoln Universityen
dc.rights.urihttps://researcharchive.lincoln.ac.nz/page/rights*
dc.subjectpeat soilen
dc.subjectpeaten
dc.subjectsphagnum peaten
dc.subjectwater retentionen
dc.subjectorganic soilen
dc.subjectbulk densityen
dc.subjectparticle densityen
dc.subjectporosityen
dc.subjectwater holding capacityen
dc.subjectmatric potentialen
dc.titleThe improvement of hydraulic properties of amended peat-based growing media : A thesis submitted in partial fulfilment of the requirements for the Degree of Master of Science at Lincoln Universityen
dc.typeThesisen
thesis.degree.grantorLincoln Universityen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Scienceen
lu.thesis.supervisorChau, Henry
lu.contributor.unitDepartment of Soil and Physical Sciencesen
dc.rights.accessRightsRestricted item - permanently embargoed
pubs.notesAbstracst - For several decades, there has been environmental pressure against extracting peat for horticultural use. Peat is a key component of soil-free substrates in the greenhouse and nursery industry. However, the increasing expense of peat, negative impacts of peat mining on wetland ecosystems, and growing perception of peat havesting as unsustainable have led to an investigation for alternatives. In this study, New Zealand peat was compared to European peat in terms of its physical and hydraulic properties. A series of laboratory tests were conducted, including bulk density, gravimetric water content, particle density, porosity, saturated hydraulic conductivity and water retention to assess if New Zealand peat can be improved to the quality of European peat. Several additives (includes bark, coir, baled peat, zeolite, sphagnum moss and “Int. peat”) were selected to mix with New Zealand peat up to 10% by volume, to improve physical properties and structure. Also, a novel methodology is developed for wetting the peat materials until near saturation gradually to determine optimum water holding capacity under a horticultural setting. In conjunction with tension table measurement, a water retention curve for each treatment tells which treatment is more aligned with European peat’s physical and hydraulic properties. The result shows New Zealand peat with 10% bark, coir, sphagnum moss, zeolite have similar hydraulic properties to European peat resulting in comparable water holding capacity. The additives of bark, coir, sphagnum moss and zeolite with New Zealand peat were tested under three trials for mushroom production. Trial data showed that with bark and sphagnum moss amendment in NZ peat, mushroom yield increases. It was concluded that a replacement of 10% volume of peat, sphagnum moss and zeolite can improve the physical properties through changes in structure and particle density.


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