Seasonal nutrient and sodium accumulation in the macrophyte Pontederia cordata

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Abstract
A seasonal study of accumulation of calcium, magnesium, sodium, potassium, and phosphorus was made on Pontederia cordata L., an important component of wetlands in North America. Twice weekly sampling of soil and plant material was made from May 23, 1975, to September 23, 1975. Results were analysed using the prepared program POLYFIT TSL, which fits a curve to the data and prepares an R2 value (coefficient of multiple determination) for the data. Positive correlations between seasonal growth events of P. cordata and accumulation of individual ions were obtained from the analysis. In addition, a positive correlation between accumulation of ions and changes of ion concentration in the upper horizon of the soil was detected for potassium and magnesium.
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