Tavakkoli, Ehsan and Jones, Ben and Coventry, Stewart and Rengasamy, Pichu and McDonald, Glenn (2010) On-farm assessment of sub-soil salinity and sodicity constraints to barley production in southern Australia. In: 15th Australian Agronomy Conference: Food Security from Sustainable Agriculture (ASA 2010), 15-18 Nov 2010, Lincoln, New Zealand.
Multiple factors contributing to subsoil constraints include salinity, sodicity, and high concentrations of chloride which are present in many rain-fed farming soils of Southern Australia. Identifying genotypes adapted to these adverse subsoil conditions and/or able to exploit subsoil water may be an option to maintain productivity of these soils. Field trials were carried out to evaluate the relative importance of high soil solution concentration of Na+ and Cl- ions on yield reduction of barley in 4 sites over 3 years in north-west Victoria and South Australia. All soils had high concentrations of exchangeable Na+ and Cl- in the subsoil and the variation in these levels were correlated with the spatial variation in yield. Grain yield was also greater in genotypes with the capacity to exclude Na+ and Cl- from their leaves. Measurement of ion concentrations from the upper two leaves of the main stem at Zadoks 65 were highly correlated with yield among 10 adapted varieties of barley and may be effective as screening criteria compared with those from the lower two leaves. The maintenance of low Cl- and Na+ concentrations in the upper two leaves offered the best guide to salt tolerance under both conditions. Potassium concentration was a poor criterion compared with the selectivity of K+ over Na+.
|Item Type:||Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)|
|Additional Information:||Copyright © 2010 Australian Society of Agronomy. This publication may be of assistance but the publisher, editors and authors do not guarantee that the publication is without flaw of any kind or is wholly appropriate for your particular purposes and therefore disclaim all liability for any error, loss or other consequence, which may arise from your relying on any information in this publication.|
|Uncontrolled Keywords:||salinity; barley; abiotic stress; subsoil constraint|
|Depositing User:||Mr Ehsan Tavakkoli|
|Date Deposited:||24 Mar 2011 12:34|
|Last Modified:||03 Jul 2013 00:35|
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