The effects of salinity on growth, nodulation and nitrogen fixation ofCasuarina equisetifolia
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The growth, nodulation and nitrogen fixation ofCasuarina equisetifolia were compared at six levels (0–500mM NaCl) of salinity in sand culture. Dry weight of nodules, shoots and roots and N content of shoots increased at intermediate levels of salinity (50–100 mM) but decreased at 500 mM NaCl. Nodulation occurred at all NaCl levels, but at 500mM NaCl level, the nodule dry weight declined by 50% from the control. Increasing NaCl concentration of up to 200mM had little effect on the N2-fixation rate, but at 500mM NaCl level the rate decreased to 40% of the control value.
Key wordsCasuarina growth nodulation nitrogen fixation salinity
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