The Effect of Salinity of Irrigation Water and Super Absorbent Polymer on Some Hydraulic and Physical Properties of Sandy Loam Soil

Document Type : Research Paper



     Since the agriculture field is the main water consumer, using techniques in order to increasing water use efficiency is necessary. Applying super absorbent polymer (SAP) could be a method to reduce consuming water in Iran.  Another method to counter water crisis is using unconventional water in agriculture, which in this terms the study of physical and chemical changes of soil properties is important. This study with the aims of the effects of super absorbent polymer and salinity of irrigation water on available water, soil porosity and saturation hydraulic conductivity was done at the Water Engineering Faculty of Shahid Chamran University of Ahvaz. This research performed in two independent experiments with three replications according to a randomized complete block design with factorial layout in three levels of salinity irrigation water, two kinds of SAP, Iranian and French, each with three levels in winter and spring of 2014. The levels of using SAP included 0, 3 and 6 g SAP per kilogram soil (0, 0.3, 0.6 weight percentage) and treatment of salinity of irrigation included 2.6, 4, 6 dS/m. After two months irrigation under salinity water treatment, sampling to determine available water, soil porosity and saturation hydraulic conductivity was done. The results showed that increasing SAP increased available water and soil porosity and decreased saturation hydraulic conductivity significantly. Increasing of water salinity decreased available water and soil porosity at 5% significantly. The iranian polymer and the french polymer lead to raise water ability 1.45 and 1.96 times and increased porosity 33.61 and 40.75 percent more than the sample without polymer.