Abstract
This work was focused on the growth and nutrition of an emergent plant species (Typha latifolia L.) developed in the secondary effluent of an urban purification plant. The growth and the productivity of the plants and the biomass distribution among roots, rhizomes and shoots were determined. The evolution of the N and P content of these organs with time was also determined and the nutrient removal carried out by the plants was calculated. Starting from these results an estimation has been made of the maximum surface over which a nitrogen-uptake limitation takes place in the plants — an aspect that can be important for obtaining the maximum efficiency of a purification system. Considerations about harvesting dates are proposed, taking into account the nutrient distributions among the plant organs.
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