Calcined materials as components of soilless root media: phosphate sorption characteristics and effects on phosphate and water use in greenhouse production of Impatiens wallerana

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dc.contributor.author Ogutu, Rose Atieno
dc.date.accessioned 2008-05-08T16:39:42Z
dc.date.available 2008-05-08T16:39:42Z
dc.date.issued 2008-05-08T16:39:42Z
dc.date.submitted May 2008 en
dc.identifier.uri http://hdl.handle.net/2097/720
dc.description.abstract The use of calcined clays contributes properties of nutrient and water retention to soilless root media, which varies greatly depending on the parent clay and calcining treatment. This research characterized phosphate (PO[subscript]4) sorption of various calcined clay products, including low volatile and regular volatile material (LVM and RVM) 2:1 Attasorb clays (Engelhard Corp.), 2:1 Terra Green LVM clays (Oil-Dri Co.), and Turface (Profile Products LLC) at various particle sizes; 1:1 kaolin clays (Thiele Kaolin Co.) in powder form, and diatomaceous earth (Diatomite, Eagle Picher Minerals, Inc.). Three of the calcined materials, Terra Green montmorillonite and Attasorb attapulgite (which had high PO[subscript]4-sorption based on isotherms), and diatomaceous earth (which had negligible PO[subscript]4-sorption) were evaluated as components of soilless root media in two separate greenhouse experiments. The effect of the calcined materials, rate of incorporation (0%, 5%, 10% and 20% by volume in a mix with peat and perlite), and PO[subscript]4-P application rate (0, 5, 15, 45 mg.L[superscript]-1 PO[subscript]4-P) on plant growth, effluent P content and water use were determined during production and post-production of Impatiens wallerana Hook f. 'Tempo Rose'. The calcined materials varied in their ability to adsorb PO[subscript]4-P and generally yielded L-type isotherms. Laboratory results indicated potential for substantive P retention by several of the calcined materials when used in container production. For most materials, PO[subscript]4-P sorption did not show pronounced pH dependence. During production and post-production, the test materials not only improved PO[subscript]4-P retention but also water retention and water use efficiency while still maintaining optimal physical properties at incorporation rates of 5 to 10%. Diatomaceous earth resulted in PO[subscript]4-P retention not significantly different from the calcined clays. en
dc.description.sponsorship The Fred C. Gloeckner Foundation en
dc.language.iso en_US en
dc.publisher Kansas State University en
dc.subject Calcined clays en
dc.subject Diatomaceous earth en
dc.subject impatiens wallerana en
dc.subject Soilless media en
dc.subject Peat based en
dc.subject Phosphate retention en
dc.title Calcined materials as components of soilless root media: phosphate sorption characteristics and effects on phosphate and water use in greenhouse production of Impatiens wallerana en
dc.type Dissertation en
dc.description.degree Doctor of Philosophy en
dc.description.level Doctoral en
dc.description.department Department of Horticulture, Forestry, and Recreation Resources en
dc.description.advisor Kimberly A. Williams en
dc.subject.umi Agriculture, Plant Culture (0479) en
dc.subject.umi Agriculture, Soil Science (0481) en
dc.date.published 2008 en
dc.date.graduationmonth May en

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