The aim of this paper was to study the restraint kinetic of N-NO3 on a sandy soil sampled from Caracal-Olt area. The kinetic study aimed to establish the interdependences between ion exchange-sorption global process and the main factors that influence the retention process on sandy soil granule level, N- NO3 concentration and N- NO3 soil load. Theoretical studies present in the speciality literature lead to various kinetic models able to give a satisfactory answer for samples regarding

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... e between rate determinative stage of ion exchange process and process parameters. The problem becomes complicate when it is necessary to describe mathematically mutual influence of different elementary stages, solving this kind of problems being impossible with the existing models. In this paper it was presented a methodology by which ion exchange process rate is expressed only based on experimental results, that aren't influenced by changes of ion exchange mechanism during process. The present paper initiates a new perspective in problem approach by offering a new graphical presentation of the experimental data (kinetical maps), after achievieng a proper experiments time table.