Abstract
Abstract A representative grassland soil of the lowland areas of the Flooding Pampa (Argentina) was sampled to study the dynamics of the non‐exchangeable ammonium under waterlogging conditions. Most of the external factors determining fixed ammonium release and fixation were considered. There was no net release of ammonium from the clay fixing‐sites to the soil solution, when this soil was flooded under laboratory conditions. We conclude that the non‐exchangeable ammonium fraction in this soil is very stable and with little importance as a nitrogen source for plants.
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