Effect of stubble height and irrigation management on the growth, botanical composition and persistence of perennial ryegrass, tall fescue and chicory swards in cool-temperate Tasmania
Article
Article Title | Effect of stubble height and irrigation management on the growth, botanical composition and persistence of perennial ryegrass, tall fescue and chicory swards in cool-temperate Tasmania |
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ERA Journal ID | 5177 |
Article Category | Article |
Authors | Langworthy, Adam D. (Author), Rawnsley, Richard P. (Author), Freeman, Mark J. (Author), Corkrey, Ross (Author), Pembleton, Keith G. (Author), Harrison, Matthew T. (Author), Lane, Peter A. (Author) and Henry, David A. (Author) |
Journal Title | Crop and Pasture Science |
Journal Citation | 70 (2), pp. 169-182 |
Number of Pages | 14 |
Year | 2019 |
Publisher | CSIRO Publishing |
Place of Publication | Australia |
ISSN | 0004-9409 |
1836-0947 | |
1836-5795 | |
Digital Object Identifier (DOI) | https://doi.org/10.1071/CP18311 |
Web Address (URL) | http://www.publish.csiro.au/cp/CP18311 |
Abstract | The profitability of dairying in south-eastern Australia can be improved by increasing pasture production during summer–autumn, when growth rates for the existing perennial ryegrass (Lolium perenne L.) feedbase are low. A study undertaken in cool-temperate north-west Tasmania examined the effect of stubble height and irrigation management on swards of perennial ryegrass, continental (summer-active) tall fescue (Festuca arundinacea Schreb.) and chicory (Cichorium intybus L.). Irrigation treatments included full irrigation (~20mm applied at every 20mm precipitation deficit), deficit irrigation (~20mm applied at alternate full-irrigation events) and rainfed (no irrigation).All species achieved greater summer–autumn yields when repeatedly defoliated to stubble heights of 35 or 55mm than when defoliated to 115 mm, irrespective of irrigation treatment. Swards were managed under a common defoliation schedule of nine defoliation events in 12 months. Under full irrigation, second-year tall fescue achieved a greater summer–autumn yield than perennial ryegrass (by 10%, or 0.7 t DM ha–1), highlighting the potential role of tall fescue in north-west Tasmania. This was further demonstrated by the high marginal irrigation water-use index values (1.6–2.7 tDM ML–1) of tall fescue. By contrast, summer–autumn growth achieved by chicory was less than or equal to perennial ryegrass. |
Keywords | basal frequency, defoliation severity, grazing intensity, residual height, water-use efficiency |
ANZSRC Field of Research 2020 | 300403. Agronomy |
300404. Crop and pasture biochemistry and physiology | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Tasmania |
School of Agricultural, Computational and Environmental Sciences | |
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q519w/effect-of-stubble-height-and-irrigation-management-on-the-growth-botanical-composition-and-persistence-of-perennial-ryegrass-tall-fescue-and-chicory-swards-in-cool-temperate-tasmania
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