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Potential of summer-active temperate (C3) perennial forages to mitigate the detrimental effects of supraoptimal temperatures on summer home-grown feed production in south-eastern Australian dairying regions
journal contribution
posted on 2023-05-19, 19:55 authored by Adam LangworthyAdam Langworthy, Richard RawnsleyRichard Rawnsley, Mark FreemanMark Freeman, Pembleton, KG, Stephen CorkreyStephen Corkrey, Matthew HarrisonMatthew Harrison, Peter Lane, Henry, DAIn many south-eastern Australian dairying regions, supraoptimal ambient temperatures (Ta > 30°C) often challenge the perennial ryegrass (Lolium perenne L.)-dominated feed-base during the summer months. A glasshouse experiment was undertaken to identify alternative summer-active temperate (C3) perennial forages more tolerant of supraoptimal temperature stress (day/night Ta of 38/25°C) than perennial ryegrass. Supraoptimal temperature stress was imposed both with and without irrigation. Chicory (Cichorium intybus L.) was the only species to survive 18 days of combined supraoptimal temperature stress and non-irrigation. Lucerne (Medicago sativa L.), plantain (Plantago lanceolate L.), and tall fescue (Festuca arundinacea Schreb.) survived 12 days of this treatment. Twelve days of exposure to these conditions caused death of perennial ryegrass, prairie grass (Bromus catharticus Vahl.), cocksfoot (Dactylis glomerate L.), birdsfoot trefoil (Lotus corniculatus L.), and red clover (Trifolium pratense L.). Irrigation (daily to through drainage) mitigated detrimental effects of imposed supraoptimal temperature stress on the growth and survival of all species. Chicory and to a lesser extent lucerne, plantain, and tall fescue may have a role to play in south-eastern Australian dairying regions, where supraoptimal temperature stress is a frequent and ongoing issue.
History
Publication title
Crop and Pasture ScienceVolume
69Issue
8Pagination
808-820ISSN
1836-0947Department/School
Tasmanian Institute of Agriculture (TIA)Publisher
CSIRO PublishingPlace of publication
AustraliaRights statement
Copyright 2018 CSIRORepository Status
- Restricted