Abstract
Gypsum soil amendments affected the concentrations of sodium in the stems and leaves of Populus seedlings irrigated with pulpmill effluent. Concentrations of sodium in the sapling tissues increased with gypsum applications which gave total calcium application rates of 175 mg Cal −1 wastewater (ww) and decreased as calcium application rates were increased to 625 mg Cal −1 ww. Conversely, stem biomass production decreased as calcium application rates increased to 175 mg Cal −1 ww and then increased as calcium application increased to 625 mg Cal t1̄ ww. This resulted in no significant differences across treatment in either total sodium uptake or removal of sodium from the soil by the Populus seedlings. Total sodium uptake by Populus was about 0.002% of wastewater inputs. Infiltration rate increased with the increasing gypsum application. Gypsum application rate was not associated with differences in the concentration and distribution of sodium in the soil profile but increased application rates were associated with decreased soil pH.
Published Version
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