Tóth T.2005. Dynamics of salt accumulation in the Danube Valley. International Salinity Forum. Oral Presentation Abstracts. April 25-27. Riverside. California. pp 449-452. CONCLUSIONS The drop of the groundwater level resulted in the reduced acreage of salt-affected areas in the region between the Danube and Tisza rivers. This is evident in the area of sand dunes, but also noticeable in the Danube valley, which was an open floodplain 80 years ago. The transformation of soils from saline-sodic to sodic is taking place at present and the tendency seems to keep on. The desalinization, which could favor crop production is not welcome, as it promotes the spreading of undesirable weeds and threatens the stability of the protected salt-affected habitats.