evaluation of the effect of irrigation with treated wastewater on some soil properties

water crisis is an important issue in arid regions like iran and has been exacerbated because of successive droughts recently. so the use of unconventional water is increasing in places where there is no good-quality water. one of these resources is urban wastewater that can provide nutrient for plant and if it has no negative impact on soil and water, it can be used for irrigation in de desertification plans. so in this research the effect of reclaimed urban wastewater on soil properties was assessed in yazd. for this aim, soil samples were taken of depths of 0-30 and 30-60 cm in three different regions including control area, planting area irrigated with reclaimed wastewater and region without any plant that is influenced by treated wastewater. the results showed that organic matter percentage, sar and ec in area affected by reclaimed wastewater were about 0.45, 112.80 and 6.25 lower than control area, respectively, but concentration of phosphorus, potassium, nitrogen and ph were about 122 ppm, 12.83 ppm, which were 0.004 % and 0.4 greater than control area, respectively. also the percentage of calcium carbonate in region with no plant that was affected by treated wastewater was about 0.52 greater than control area and in planting area irrigated with wastewater was about 1.6 lower than control area.