Winter survival of bermudagrasses (Cynodon sp.) as influenced by deacclimation, low temperatures, and dormancy periods

The most importunate problem in using bermudagrasses (Cynodon sp.) for turf in the northern extremity, where semitropical grasses are adapted, is winter survival. This research was primarily conducted to investigate the effects of deacclimation of dormancy, duration of dormancy, and freezing tempera...

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Main Author: Chalmers, David R.
Other Authors: Agronomy
Format: Others
Language:en_US
Published: Virginia Polytechnic Institute and State University 2017
Subjects:
Online Access:http://hdl.handle.net/10919/75994
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spelling ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-759942020-10-24T05:32:41Z Winter survival of bermudagrasses (Cynodon sp.) as influenced by deacclimation, low temperatures, and dormancy periods Chalmers, David R. Agronomy LD5655.V855 1978.C46 Bermuda grass The most importunate problem in using bermudagrasses (Cynodon sp.) for turf in the northern extremity, where semitropical grasses are adapted, is winter survival. This research was primarily conducted to investigate the effects of deacclimation of dormancy, duration of dormancy, and freezing temperatures on survival of bermudagrasses. 'Tifgreen' bermudagrass taken from the field in February, 1976, was deacclimated for 0, 2, 4, or 8 days at 27C/13C (day/night). Subsequently, rhizomes and stolons were subjected to +2, 0, -2, -4, or -6C for 24 hours. One third of the samples from each treatment were planted after 0, 45, and 90 days storage at 2.8C±1.6C. Rhizomes and stolons subjected to -4 or -6C did not survive. Deacclimation of rhizomes up to 8 days augmented growth as compared to no deaccli~ation. Increased storage periods caused decreased rhizome growth. At +2 and 0C, the percent rhizome growth was similar but significantly higher than at -2C. With 0 storage, stolon growth declined after 8 days deacclimation; however, after 45 or 90 days of storage, significant reductions occurred after only 4 days deacclimation. Fully deacclimated as well as dormant field samples of 'Midiron', 'Tifdwarf', 'Tifgreen', 'Tifway' and 'Tufcote' taken in March and April, 1977, were subjected to -2, -4, and -6C. All cultivars survived -4C whether dormant or actively growing. 'Tifgreen' bermudagrass frozen while dormant and 'Tifgreen' and 'Tifdwarf' frozen while actively growing had high recuperative potentials during regrowth. Comparing these cultivars under field conditions showed best winter survival for 'Midiron', which was the only cultivar that survived with simulated traffic. Traffic imposed immediately prior to bermudagrass dormancy reduced spring recovery more than for traffic imposed during winter. Master of Science 2017-03-09T21:35:08Z 2017-03-09T21:35:08Z 1978 Thesis Text http://hdl.handle.net/10919/75994 en_US OCLC# 8608970 In Copyright http://rightsstatements.org/vocab/InC/1.0/ v, 48 leaves. application/pdf application/pdf Virginia Polytechnic Institute and State University
collection NDLTD
language en_US
format Others
sources NDLTD
topic LD5655.V855 1978.C46
Bermuda grass
spellingShingle LD5655.V855 1978.C46
Bermuda grass
Chalmers, David R.
Winter survival of bermudagrasses (Cynodon sp.) as influenced by deacclimation, low temperatures, and dormancy periods
description The most importunate problem in using bermudagrasses (Cynodon sp.) for turf in the northern extremity, where semitropical grasses are adapted, is winter survival. This research was primarily conducted to investigate the effects of deacclimation of dormancy, duration of dormancy, and freezing temperatures on survival of bermudagrasses. 'Tifgreen' bermudagrass taken from the field in February, 1976, was deacclimated for 0, 2, 4, or 8 days at 27C/13C (day/night). Subsequently, rhizomes and stolons were subjected to +2, 0, -2, -4, or -6C for 24 hours. One third of the samples from each treatment were planted after 0, 45, and 90 days storage at 2.8C±1.6C. Rhizomes and stolons subjected to -4 or -6C did not survive. Deacclimation of rhizomes up to 8 days augmented growth as compared to no deaccli~ation. Increased storage periods caused decreased rhizome growth. At +2 and 0C, the percent rhizome growth was similar but significantly higher than at -2C. With 0 storage, stolon growth declined after 8 days deacclimation; however, after 45 or 90 days of storage, significant reductions occurred after only 4 days deacclimation. Fully deacclimated as well as dormant field samples of 'Midiron', 'Tifdwarf', 'Tifgreen', 'Tifway' and 'Tufcote' taken in March and April, 1977, were subjected to -2, -4, and -6C. All cultivars survived -4C whether dormant or actively growing. 'Tifgreen' bermudagrass frozen while dormant and 'Tifgreen' and 'Tifdwarf' frozen while actively growing had high recuperative potentials during regrowth. Comparing these cultivars under field conditions showed best winter survival for 'Midiron', which was the only cultivar that survived with simulated traffic. Traffic imposed immediately prior to bermudagrass dormancy reduced spring recovery more than for traffic imposed during winter. === Master of Science
author2 Agronomy
author_facet Agronomy
Chalmers, David R.
author Chalmers, David R.
author_sort Chalmers, David R.
title Winter survival of bermudagrasses (Cynodon sp.) as influenced by deacclimation, low temperatures, and dormancy periods
title_short Winter survival of bermudagrasses (Cynodon sp.) as influenced by deacclimation, low temperatures, and dormancy periods
title_full Winter survival of bermudagrasses (Cynodon sp.) as influenced by deacclimation, low temperatures, and dormancy periods
title_fullStr Winter survival of bermudagrasses (Cynodon sp.) as influenced by deacclimation, low temperatures, and dormancy periods
title_full_unstemmed Winter survival of bermudagrasses (Cynodon sp.) as influenced by deacclimation, low temperatures, and dormancy periods
title_sort winter survival of bermudagrasses (cynodon sp.) as influenced by deacclimation, low temperatures, and dormancy periods
publisher Virginia Polytechnic Institute and State University
publishDate 2017
url http://hdl.handle.net/10919/75994
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