Due to low rainfall and shortage of renewable water resources, especially in recent two decades, the use of trickle irrigation systems which improve field irrigation efficiency is recommended. The main problem with trickle irrigation is the emitter’s clogging which is caused by different materials. Merus ring is one of the new method which can prevent corrosion, sedimentation and biological clogging. The Merus ring affects the physical and chemical characteristics of water. This study was performed in the field located at Isfahan University of Technology to investigate the effect of Merus ring on emitter’s clogging and chemical characteristics of soil under trickle irrigation system. Two main treatments of irrigation water, with Merus ring and without Merus ring, and three sub-treatments of irrigation water salts were used. The experiment was laid out with a complete randomized block design with three replications. The experiment was run for three months and each treatment was irrigated for three hours every day. During the experiment, emitter’s discharges were collected at four periods of time and samples from emitter’s discharges to investigate the variations in chemical characteristics of irrigation water were collected at two periods of time including middle and end of the experiment. To study the effect of Merus ring on chemical characteristics of soil under trickle irrigation, soil samples were taken at four periods of time during the experiment from the soil beneth the emitter belonging to one of the irrigation water salinity treatment. The results showed that the effect of irrigation water treatment on electrical counductivity, calcum ions and also Langelier saturation index of irrigation water are ignificant at 1% level. The values of the above parameters were higher for treatment of with using Merus ring as compared to the treatment of without using Merus ring. The values of electrical counductivity and ions of calcium, magnesium, sodium and bicarbonate of irrigation water were decreased with time during the experiment for both irrigation water treatments. The decrease of the above values were higher for treatment of without using Merus ring as compared to the treatment of with using Merus ring. The results showed that the irrigation water treatment had significant effect on average emitter’s discharge at 1% level. The average emitter’s discharge was higher for the treatment of with using Merus ring as compared to the treatment of without using Merus ring. For both irrigation water treatments, the average emitter’s discharge decreased with time during the experiment, but the decrease was higher for the treatment of without using Merus ring as compared to the treatment of with using Merus ring. The irrigation water treatment had significant effect on electrical counductivity of soil saturation extract at 5% level. The electical counductivity of soil saturation extract was lower for the treatment of with using Merus ring as compared to the treatment of without using Merus ring. The results showed that the use of Merus ring in trickle irrigation reduces emitter’s clogging and causes higher soluble salts and leaching of salts to the lower soil depths.