In recent decades, due to limitations of available water resources for agricultural consumption and grow of population, the necessity of using pressurized irrigation systems especially trickle irrigation system have been increased. To reclaim soil and water, magnetized water can be used. Magnetized water is produced by passing of water through a strong permanent magnet installed in or on a feed pipeline. This study was performed at Gorgan Agricultural and Natural Resources Research center, in Gorgan province, to investigate emitter clogging and uniformity of distribution of water in trickle irrigation. Two main treatments of magnetic and non-magnetic irrigation water and three sub-treatments of irrigation water salts including well water as control, 200 ppm calcium carbonate and 400 ppm calcium carbonate were used. The experiment was performed as a complete randomized block design with three replications. The data for emitter discharges were collected at five different times during the irrigation season and the data for water properties (Langelier Saturation Index) were collected at three different times during irrigation season including the beginning, the middle and the end of the experiment. The results showed that the effect of type of irrigation water (magnetic and non-magnetic irrigation water) on electrical conductivity of irrigation water was significant at 1% probability level. But the decrease in electrical conductivity of magnetic irrigation water was lower than the non-magnetic irrigation water. For both magnetic and non-magnetic irrigation water, the salt contents decreased with time during the irrigation season, but the decreases were not significant. The effect of magnetic irrigation water on Langelier Saturation Index ( Key words: Trickle irrigation, magnetic water, emission uniformity, Langelier Saturation Index
