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RESEARCH ARTICLE
Contents Vol 48(4)

Production and persistence of annual pasture legumes at five saline sites in southern Australia

P. G. H. Nichols A B H J , A. D. Craig C H , M. E. Rogers D H , T. O. Albertsen E H , S. M. Miller C H I , D. R. McClements A H , S. J. Hughes F H , M. F. D’Antuono A and B. S. Dear G H
+ Author Affiliations
- Author Affiliations

A Department of Agriculture and Food Western Australia, Locked Bag 4, Bentley Delivery Centre, WA 6983, Australia.

B School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, Crawley, WA 6009, Australia.

C South Australian Research and Development Institute, Struan Research Centre, PO Box 618, Naracoorte, SA 5271, Australia.

D Primary Industries Research Victoria, Department of Primary Industries Victoria, Tatura, Vic. 3616, Australia.

E Department of Agriculture and Food Western Australia, Great Southern Agricultural Research Institute, Katanning, WA 6317, Australia.

F South Australian Research and Development Institute, Plant Research Centre, Waite Campus, Adelaide, SA 5001, Australia.

G EH Graham Centre for Agricultural Innovation (Alliance between New South Wales Department of Primary Industries and Charles Sturt University), Pine Gully Road, Wagga Wagga, NSW 2650, Australia.

H Cooperative Research Centre for Plant-based Management of Dryland Salinity, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.

I Present address: South East Natural Resources Management Board, Mount Gambier, SA 5290, Australia.

J Corresponding author. Email: pnichols@agric.wa.gov.au

Australian Journal of Experimental Agriculture 48(4) 518-535 https://doi.org/10.1071/EA07167
Submitted: 5 June 2007  Accepted: 2 January 2008   Published: 7 March 2008

Abstract

Herbage production and persistence of 42 annual pasture legumes from 33 species were measured at five sites across southern Australia. Medicago polymorpha L. was highly productive on soils, particularly those not prone to waterlogging, with soil surface (0–10 cm soil depth) salinity [estimated by electrical conductivity (ECe)] levels in summer of up to 36 dS/m, whereas M. truncatula Gaertn. was productive on ECe levels of at least 11 dS/m. Trifolium michelianum Savi and T. resupinatum L. were highly productive on soils subject to waterlogging, but only where 0–10 cm summer ECe levels were less than 8 dS/m. No commercial species were adapted to highly saline (0–10 cm summer ECe levels >8 dS/m), waterlogged sites. However, Melilotus siculus (Turra) Vitman ex B.D. Jacks. has the potential to fulfil this role, provided an appropriate Rhizobium strain can be selected. Mixtures of species and cultivars should be sown to account for high spatial variability for salinity and waterlogging. Traits for annual legume success in saline landscapes include salinity and waterlogging tolerance in germinating seedlings and mature plants, early flowering, hardseededness and delayed softening of hard seeds. Establishment of regenerating seedlings is associated with the timing of hardseed softening in relation to rainfall events capable of leaching topsoil salts. It is proposed that salinity measurements to determine annual legume suitability for winter-dominant rainfall areas are made in summer or early autumn, when at their highest levels. Transects along salinity and waterlogging gradients are suggested as an alternative method to traditional plots for genotype evaluation.

Additional keywords: biomass, establishment, plant breeding, plant evaluation, waterlogging.


Acknowledgements

We would like to thank Tony York, Ian Peirce, Andrew Toovey, Dennis and Heather Sanders and Lewis Watson and their families for their support and use of land to conduct the research. The able technical assistance of Wayne Dempsey, David Cornwall and Graeme Phyland is gratefully acknowledged. Rhizobia were supplied by Nigel Charman and Ross Ballard (South Australian Research and Development Institute). The helpful comments of Dr Ed Barrett-Lennard and another anonymous referee improved the manuscript. Funding was provided by the Grains Research and Development Corporation and Land, Water and Wool (a joint initiative of Land and Water Australia and Australian Wool Innovation), through the Sustainable Grazing on Saline Lands sub-program (which included co-investment from Meat and Livestock Australia).


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