Expérimentation et modélisation de la lixiviation de lʹazote nitrique dans un sol sableux

We performed two column experiments to study the impact of different levels of irrigation intensity on the leaching of nitric nitrogen. The experiment was run on a soil packed column and using 200 kg N/ha as fertilization rate for the first column, and none for the second. In parallel, we carried out digital simulations (mechanist model) to study the transfer of nitrogen through the studied columns followed by an application of the model to various amounts of nitrogen. The impact study of successive irrigations showed that these contribute to the transport and the accumulation of nitric nitrogen of the upper layers towards the deeper layers. The quantity of nitric nitrogen N–NO3 drained by scrubbing was about 191 kg N/ha for the first column, and 15 kg N/ha for the second. In addition, the numerical simulations revealed that the precision of the model is satisfactory with an over-estimation of about 20%. To cite this article: M. Ibnoussina et al., C. R. Geoscience 338 (2006).