Abstract
The electrical conductivity (EC) and ionic composition of the soil solution of a Haplic Calcisol in Campo de Cartagena (Murcia, Spain) were studied <em>in situ</em> for four years in an experimental open-air vegetable plot, together with the relationship between these parameters, the quality of the irrigation water and the management of the plot. The results show that there were very significant fluctuations in these variables during the study period and that these fluctuations depended on the management of the plot and in particular on the irrigation water used. Therefore, for an adequate management of these agro-ecosystems, it is necessary to establish a network of experimental plots <em>in situ</em>, where sensitive indicators of soil degradation are monitored, in our case the EC and the ionic composition of the soil solution. Such indicators are capable of detecting these degradation processes and their relationship with the inappropriate management of this resource.
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