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USE OF ENVIRONMENTAL DATA IN ASSESSING THE QUALITY OF IRRIGATION WATER

The quality of irrigation water of selected rivers in Natal is characterized in terms of chemical components related to salinity and sodicity. Using rainfall and evapotranspiration data for each sampling site, and assuming certain management practices, we calculated the anticipated soil water salinity and sodicity values for poorly drained soils, obtaining four variables to assess water quality: water salinity and sodicity and soil salinity and sodicity. Grouping the data according to crop salt tolerance and soil sodicity limitations confirms the evaluation of water quality obtained using recently published schemes for assessing irrigation water. The general agreement between schemes for classifying irrigation water indicates the feasibility of using a system of evaluation of water quality based on crop, soil, and climatic characteristics of the area under consideration. Comparing the saturation extract salinity and sodicity of poorly drained soils with salinity and sodicity calculated from this environmental model showed reasonably good agreement, which did not invalidate the general qualitative usefulness of this approach.