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dc.contributor.authorLaBranche, Adrienne Janelen_US
dc.description.abstractA four-year drought, increasing population and shifting climate has spurred water conservation practices within Virginia. Creeping bentgrass (Agrostis palustris â L93â ), Kentucky bluegrass (Poa pratensis â Midnightâ ), and tall fescue (Festuca arundinacea) Dominion blend were evaluated under deficit irrigation and upon exogenous application of plant growth stimulants (PGS), seaweed extract (SWE) + humic acid (HA), glycinebetaine (GB) and a commercial SWE product (PP). The objectives were to determine crop coefficients (Kc) for creeping bentgrass fairways and tall fescue home lawns, to determine if PGS application allowed for more water conservation, and to determine if they impacted physiological function and/or root morphology. A preliminary greenhouse experiment was conducted with creeping bentgrass and Kentucky bluegrass irrigated with 100%, 85% and 70% of evapotranspiration (ET). The study determined that an additional deficit irrigation level should be included for the field study and that GB application and 100% and 85% ET irrigation level produced the greatest creeping bentgrass root mass. The two â year field study evaluated creeping bentgrass and tall fescue. Tall fescue home lawns could be irrigated every five days with a Kc of 0.55 or once a week with a Kc of 0.70. Creeping bentgrass fairways could be irrigated every four days with a Kc of 0.85. Glycinebetaine application increased bentgrass rooting after planting and showed osmoprotectant properties. Another greenhouse study evaluated five GB rates on bentgrass and tall fescue. No differences were found between the five rates and concluded that the rate utilized in the field study may be appropriate for turfgrass application.en_US
dc.publisherVirginia Techen_US
dc.rightsI 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 Virginia Tech 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.subjectHumic aciden_US
dc.subjectSeaweed extracten_US
dc.subjectDrought resistanceen_US
dc.subjectCrop coefficienten_US
dc.titleCreeping Bentgrass, Kentucky Bluegrass and Tall Fescue Responses to Plant Growth Stimulants Under Deficit Irrigationen_US
dc.contributor.departmentCrop and Soil Environmental Sciencesen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineCrop and Soil Environmental Sciencesen_US
dc.contributor.committeechairErvin, Erik H.en_US
dc.contributor.committeememberHarris, James Rogeren_US
dc.contributor.committeememberEvanylo, Gregory K.en_US

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