Assessment of Turfgrass Root Growth in Compacted Soils

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dc.contributor.advisor D. Keith Cassel, Committee Chair en_US
dc.contributor.advisor Daniel C. Bowman, Committee Member en_US
dc.contributor.advisor Thomas W. Rufty, Committee Member en_US
dc.contributor.advisor Bir B. Thapa, Committee Member en_US Matthieu, Donald Edwin III en_US 2010-04-02T18:03:25Z 2010-04-02T18:03:25Z 2007-03-09 en_US
dc.identifier.other etd-03092006-140602 en_US
dc.description.abstract Soil compaction often prevents turfgrass roots from growing to deeper sources of water and nutrients. Root response of ten turfgrass species to a compacted subsurface layer was examined in a greenhouse experiment. Research objectives were to determine if a compacted subsurface soil layer reduces root penetration and shoot growth for each of ten turfgrass species and to determine the bulk density of a subsurface layer at which root growth is impaired for each of ten turfgrass species. Ten turfgrass species were grown for four to eight weeks in 13-cm diameter x 25-cm long columns filled with loamy sand soil material. Each column was divided into three sections. The top and bottom sections were packed to a bulk density of 1.6 Mg cm-3, and the middle (treatment) layer was packed to 1.6, 1.7, 1.8, 1.9, or 2.0 Mg m-3. Soil compaction reduced root growth for each of the ten turfgrass species; the effect of compaction on root and shoot growth varied among species. Root penetrability varied among species and bulk densities as determined by the amount of root dry mass recovered in the bottom of each column. Root biomass in the bottom layer decreased as bulk density of the middle layer increased, with the most significant reduction occurring between 1.7 and 1.8 Mg m-3 for Kentucky bluegrass, bentgrass, perennial ryegrass, tall fescue, St. Augustinegrass, and paspalum. A significant growth reduction occurred between 1.8 and 1.9 Mg m-3 for zoysiagrass, centipedegrass, bermduagrass, and buffalograss. Better turf growth can be expected if management practices are used which eliminate compacted subsurface layers or reduce soil compaction prior to turf establishment. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject Soil Compaction en_US
dc.subject Subsurface Soil Compaction en_US
dc.subject Soil Physical Properties en_US
dc.subject Turfgrass en_US
dc.title Assessment of Turfgrass Root Growth in Compacted Soils en_US MS en_US thesis en_US Soil Science en_US

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