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

Langworthy, Adam D. and Rawnsley, Richard P. and Freeman, Mark J. and Pembleton, Keith G. and Corkrey, Ross and Harrison, Matthew T. and Lane, Peter A. and Henry, David A. (2018) 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. Crop and Pasture Science, 69 (8). 808-820 . ISSN 1836-0947

Abstract

In 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 lanceolata 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 glomerata 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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 10 Dec 2018 05:46
Last Modified: 04 Jul 2019 01:19
Uncontrolled Keywords: chlorophyll fluorescence, drought, heat stress, heat tolerance, thermotolerance, water stress
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070303 Crop and Pasture Biochemistry and Physiology
Socio-Economic Objective: B Economic Development > 83 Animal Production and Animal Primary Products > 8304 Pasture, Browse and Fodder Crops > 830402 Lucerne
B Economic Development > 83 Animal Production and Animal Primary Products > 8304 Pasture, Browse and Fodder Crops > 830406 Sown Pastures (excl. Lucerne)
Identification Number or DOI: https://doi.org/10.1071/CP17291
URI: http://eprints.usq.edu.au/id/eprint/35237

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