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ABSTRACT
Response of Sagittaria lancifolia L. to added 15N labelled nitrogen was studied in a Louisiana Gulf Coast freshwater marsh. The amount of the added labelled NH4+-N remaining in the soil or plant tissue was determined several times during the growing season. Above-ground biomass increased by approximately 100 percent following the addition of 10 g NH4 +-N/m2. There was no significant nitrogen loss from the soil during the growing season after the labelled inorganic nitrogen was apparently immobilized into the soil organic nitrogen pool.