Flood spreading is one of the techniques to supply of water in the arid and semi arid regions in order to use of flash floods. Soil properties can influence floodwater quality and have an important role on the success of flood spreading systems. Because developing of flood-spreading schemes in the unsuitable areas from viewpoint of the soil and flood qualities may lead to some differences in soil properties in such areas. So, to find out the suitable methods to inhibit of soil degradation, it is needed to study of the soil physico-chemical characteristics of flood spreading systems. In this research, some soil qualities of Poldasht flood spreading station were studied during 4 years. The treatments were: Control; without flood spreading and seedling Flood spreading with seedling Flood spreading without seedlingSome soil properties that in this research measured and analyzed were included of infiltration rate, soil texture fractions, pH, EC, TNV, soluble Ca, Mg 2+ and Na +, SP%, OC% and Bulk Density. The means of measures were compared using LSD (Lowest Significant Difference) test. The results showed there are significant differences among some soil properties during 4 years of examinations. In comparison with the first year, some parameters such as EC, SP%, OC% and clay percent were increased whereas pH, Sand and Infiltration rate decreased. This means that flood spreading has had some positive and negative effects on the soil properties in Poldasht flood spreading station but the rate and trend of differences are very slow. So it is expected there will some difficulties in the future due to the differing in soil texture, decreasing of infiltration rate and increasing of soil salinity.
Key words: Flood spreading, Poldasht flood spreading station, Soil infiltration rate, Soil properties, West Azarbaijan
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