Yield and quality characteristics of bahiagrass (Paspalum notatum) exposedto ground-level ozone

Citation
Rb. Muntifering et al., Yield and quality characteristics of bahiagrass (Paspalum notatum) exposedto ground-level ozone, ANIM FEED S, 84(3-4), 2000, pp. 243-256
Citations number
37
Categorie Soggetti
Animal Sciences
Journal title
ANIMAL FEED SCIENCE AND TECHNOLOGY
ISSN journal
03778401 → ACNP
Volume
84
Issue
3-4
Year of publication
2000
Pages
243 - 256
Database
ISI
SICI code
0377-8401(20000505)84:3-4<243:YAQCOB>2.0.ZU;2-V
Abstract
Early and late season-planted bahiagrass (Paspalum notatum Flugge, cultivar 'Pensacola') were grown in open-top chambers (OTC) to which added air had been carbon-filtered (CF), representative of that found at pristine air qua lity sites; non-filtered (NF), characteristic of ambient air in Auburn, AL and representative of that found in rural agricultural areas; or enriched w ith ozone (O-3) to twice-ambient O-3 concentration (2X), representative of that found in the vicinity of large metropolitan areas. Primary-growth and regrowth forages from each planting were harvested periodically throughout the experiment from each of six OTC (two OTC/air treatment). Mean daytime ( 09:00-21:00 h) O-3 concentrations over the entire 24-week experiment (7 May -23 October 1997) were 22, 45 and 91 eta 11(-1), respectively, for CE NF an d 2X treatments. Mean daytime ambient O-3 concentrations peaked in mid-May and again in late August-late September at 50-60 60 eta 11(-1), and highest individual ambient O-3 concentrations were recorded in late June, late Jul y, late August and mid-September at similar to 90 eta 11(-1). Dry matter (D M) yield was greater for CF than for NF primary-growth forage, and concentr ations of neutral detergent fiber (NDF) were higher in 2X than in NF primar y-growth and regrowth forages from the early-season planting. Concentration of acid detergent fiber (ADF) tended to be higher in 2X than in NF primary -growth forage and was higher in 2X than in NF regrowth forage, whereas aci d detergent lignin (ADL) concentration was higher in 2X than in NF primary- growth forage and tended to be higher in 2X than in NF regrowth forage from the early-season planting. Crude protein (CP) concentrations were lower in CF than in NF regrowth forage from the early-season planting and in CF tha n in NF primary-growth forage from the initial harvest of the late-season p lanting. No differences were observed among treatments in DM yield or conce ntrations of cell wall constituents in primary-growth or regrowth forages f rom the late-season planting, although concentrations of CP, NDF and ADF te nded to be higher in 2X than in NF regrowth forage. No differences were obs erved among treatments in concentrations of total phenolics in primary-grow th or regrowth forages from either planting, although concentrations of tot al phenolics tended to be higher in CF than in NF primary-growth forage fro m the late-season planting. Particularly in the case of early-planted bahia grass, alterations in DM yield and quality of primary-growth and vegetative regrowth forages were of sufficient magnitude to have nutritional and poss ibly economic implications to their utilization for ruminant animal product ion under existing and projected global climate scenarios. (C) 2000 Elsevie r Science B.V. All rights reserved.