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Full TGIF Record for: 105277
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Monographic Author(s):Larsen, Søren Ugilt
Author Affiliation:Department of Agricultural Sciences, The Royal Veterinary and Agricultural University, Taastrup, Denmark
Item is a:*Report
*Dissertation
Monograph:A Study of Factors Affecting Germination, Establishment, and Competition of the Turfgrass Species Red Fescue (Festuca rubra L. spp. litoralis Vasey), Perennial Ryegrass (Lolium perenne L.) and Kentucky Bluegrass (Poa pratensis L.), 2004.
# of Pages:147
Publishing Information:Ph.D. Dissertation: The Royal Veterinary and Agricultural University
Collation:141 pp.; [6 pp.]
Series:Forest & Landscape Research No. 34-2004
Keywords:TIC Keywords: Competition; Cultivar evaluation; Cultivation methods; Establishment; Festuca rubra subsp. trichophylla; Germination; Lolium perenne; Poa pratensis; Seed germination; Seeding time
Abstract:"Turfgrass is an important crop, which requires intensive cultivation during establishment and management. Proper cultivation must be based on thorough knowledge about the biology and dynamics of the turfgrass ecosystem. This thesis is concerned with germination, establishment, and competition of turfgrass mixtures consisting of slender creeping red fescue (Festuca rubra L. ssp. litoralis Vasey), perennial ryegrass (Lolium perenne L.), and Kentucky bluegrass (Poa pratensis L.). The main conclusions are mentioned below. A two-year field study confirmed that Kentucky bluegrass establishes poorly in mixtures with red fescue and perennial ryegrass, i.e. a large proportion of Kentucky bluegrass in the seed mixture results in a relatively small proportion of shoots in the established turf. When seeds of Kentucky bluegrass were sown prior to seeds of red fescue and perennial ryegrass, the proportion of Kentukcy bluegrass shoots in the established turf was increased. This shows that the time factor is important for the competitive balance between the species during establishment. A number of laboratory experiments were done to study differences in germination hebaviour between the three grass species. A part of the thesis is concerned with methodology in germination studies. Three different germination criteria, which were compared with the normal seedling criteria, provided similar results but tended to overestimate the germination percentage compared to the proportion of normal seedlings. Germination time courses were effectively summarized by a generalized hyperbolic multinomial distribution. Germination response to reduced water potential could be described by the hydrotime model, using repeated probit analysis. Germination response to temperature could be described by the thermal time model, but a non-linear regression analysis based on the Weibull function was superior to the repeated probit analysis. There were interacting effects of water potential and temperature, which affected the use of the hydrothermal time model. Finally, another important methodological conclusion is that seed lots from the same cultivar may differ considerably in seed weight and germination characteristics, and in germination studies each cultivar should, therefore, be represented by more than one seed lot. The germination studies revealed distinct differences between the three grass species. Seeds of Kentucky bluegrass require a longer thermal time for germination compared to seeds of red fescue and perennial ryegrass. At reduced water potential, germination percentage is more reduced and time to germination is more increased for Kentucky bluegrass seeds than for seeds of the other species. The results strongly suggest that poor establishment of Kentucky bluegrass in mixture with red fescue and perennial ryegrass is related to the slower germination and lower germination percentage of Kentucky bluegrass seeds, which is particularly pronounced at low temperatures and at reduced water potentials. Within the three grass species, germination characteristics differ between cultivars, between seed lots within cultivars, and even between seeds of a single seed lot, with heavy seeds germinating better than light seeds. The effect of choosing a fast germinating cultivar or removing light seeds of a seed lot of Kentucky bluegrass was, however, relatively small compared to the required difference in sowing time to improve the establishment of this species. Variation in seed weight between cultivars and seed lots within cultivars is distinct. When considering a seed mixture of a specific species composition by weight, seed mixture compostiion by number may, therefore, vary markedly depending on the seed weight of the applied cultivars and seed lots."
Library of Congress
Subject Headings:
Turfgrasses -- Preharvest sprouting -- Effect of temperature on; Turfgrasses -- Preharvest sprouting -- Effect of water levels on; Turfgrasses -- Seeds; Turfgrasses -- Sowing; Lolium perenne -- Preharvest sprouting; Red fescue -- Preharvest sprouting; Kentucky bluegrass -- Preharvest sprouting
Language:English
References:42
See Also:See also "Paper I: Differential sowing time of turfgrass species affects the establishment of mixtures", reprinted from Crop Science, 44(4), July/August, 2004, p. 1315-1322, R=97004 click here
See Also:See also "Paper II: The variation in seed weight within and among cultivars of slender creeping red fescue (Festuca rubra ssp. litoralis), perennial ryegrass (Lolium perenne), and Kentucky bluegrass (Poa pratensis) and its importance for the composition of seed mixtures", reprinted from Seed Science and Technology, 32(1), 2004, p. 135-147, R=97292 click here
See Also:See also "Paper III: Comparison of germination criteria in red fescue (Festuca rubra ssp. litoralis), perennial ryegrass (Lolium perenne), and Kentucky bluegrass (Poa pratensis)", reprinted from Seed Science and Technology, 32(2), 2004, p. 341-354, R=105279 click here
See Also:See also "Paper IV: Use of germination curves to describe variation in germination characteristics in three turfgrass species", reprinted from Crop Science, 44(3), May/June, 2004, p. 891-899, R=95072 click here
See Also:See also "Paper V: Use of the hydrothermal time model to analyse interacting effects of water and temperature on germination of three grass species", reprinted from Seed Science Research, 14(1), March, 2004, p. 35-50, R=105280 click here
See Also:See also "Paper VI: Comparison of two methods for estimating thermal requirements for germination of three turfgrass species at suboptimal temperatures", p. 107-128, R=174048 click here
See Also:See also "Paper VII: Light and heavy turfgrass seeds differ in germination percentage and mean germination thermal time", reprinted from Crop Science, 44(5), September/October, 2004, p. 1710-1720, R=97724 click here
Note:Summary as abstract
Note:Appendix of Papers, p. 4
Note:Summary appears in English and Danish, p. 5-8
Note:Preface appears in English and Danish, p. 9-12
Note:Pictures, color
Note:Tables
Note:Graphs
 ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Larsen, Søren Ugilt 2004. A Study of Factors Affecting Germination, Establishment, and Competition of the Turfgrass Species Red Fescue (Festuca rubra L. spp. litoralis Vasey), Perennial Ryegrass (Lolium perenne L.) and Kentucky Bluegrass (Poa pratensis L.). Ph.D. Dissertation: The Royal Veterinary and Agricultural University.
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