Sustainable agriculture and sustainability of water resources from the aspect of environmental protection

The international community has recognized soil salinization as one of the biggest global problems when it comes to soil conservation and its fertility, where the quality of water used for irrigation is a very important factor. Institute ofSoil Science in Belgrade conducted research on the properties of agricultural soil and irrigation water sampled at locations under irrigation systems within 6 areas of central Serbia (Braničevska, Podunavska, Pomoravska, Moravička, Mačvanska,and Toplička) in the period 2015-2018. Irrigation water was sampled at the research sites, in which the parameters for assessing its quality were analyzed (pH, electrical conductivity, sodium adsorptionratio, fixed residue). Five different classifications of irrigation water, which define the degree of risk of salinization and alkalization of soil due to the use of water of a certain quality for irrigation purposes, were applied in the paper. It was observed that a number of samples fall into different classes of application possibilities for irrigation according to different classifications. In some areas, the percentage of samples where a mismatch among classifications was observed is not negligible. Worldwide, priority is given to different classifications depending on practical experience and scientific conclusions. Many factors affect the degree of risk of soil salinization that issubject to change in the conditions of climate change. Having in mind the importance and prevalence of soil salinization, we conclude that the practice of using a number of classifications and their revision over time is a positive example and useful tool in the prevention and combat against soil salinization.