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Measurement and Interpretation of Salinity Tolerance in Four Perennial Grasses

Kopittke, P.M. and Kopittke, R.A. and Menzies, N.W. (2009) Measurement and Interpretation of Salinity Tolerance in Four Perennial Grasses. Journal of Plant Nutrition, 32 (1). pp. 30-43.

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Article Link(s): http://dx.doi.org/10.1080/01904160802530995

Publisher URL: http://www.tandf.co.uk/journals/alphalist.asp

Abstract

Whilst the topic of soil salinity has received a substantive research effort over the years, the accurate measurement and interpretation of salinity tolerance data remain problematic. The tolerance of four perennial grass species (non-halophytes) to sodium chloride (NaCl) dominated salinity was determined in a free-flowing sand culture system. Although the salinity tolerance of non-halophytes is often represented by the threshold salinity model (bent-stick model), none of the species in the current study displayed any observable salinity threshold. Further, the observed yield decrease was not linear as suggested by the model. On re-examination of earlier datasets, we conclude that the threshold salinity model does not adequately describe the physiological processes limiting growth of non-halophytes in saline soils. Therefore, the use of the threshold salinity model is not recommended for non-halophytes, but rather, a model which more accurately reflects the physiological response observed in these saline soils, such as an exponential regression curve.

Item Type:Article
Corporate Creators:Horticulture and Forestry Science
Additional Information:© Taylor & Francis.
Keywords:Growth response; salinity threshold; threshold salinity model; salt tolerance; relative humidity.
Subjects:Science > Botany
Agriculture > Agriculture (General) > Soils. Soil science
Deposited On:10 Feb 2009 06:32
Last Modified:19 Nov 2010 05:27

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