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Measurement and Interpretation of Salinity Tolerance in Four Perennial Grasses

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Kopittke, P.M., 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: http://dx.doi.org/10.1080/01904160802530995

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


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
Live Archive:10 Feb 2009 06:32
Last Modified:03 Sep 2021 16:47

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