In order to comparison of the effect of magnetic drip irrigation and conventional irrigation with different salinity on the water productivity, yield and yield components of sunflower, a factorial experiment was conducted in a completely randomized design with six treatments and three replications at the Research Station of the Faculty of Water Sciences Engineering of Shahid Chamran University of Ahvaz was executed in 2016-17. The treatments consisted of two levels of water (magnetic and non-magnetic) and salinity in three levels (Karun River water (S1), 4 ( S2) and 6 (S3)dS/m). The results of analysis of variance of different traits measured in the experiment showed that the effect of irrigation water type on stem height, stem diameter, head diameter, leaf weights, 100 seed weight and irrigation water productivity index for biomass yield at 1% level and head and stem fresh weight, leaf area index, grain yield, 100 seed weight and irrigation water productivity index for seed yield were significant at 5% level and had no significant effect on the rest of the cases. The use of magnetic irrigated water increased the efficiency of irrigation water for biomass yield, stem height and weight of 100 seeds, respectively, 13.9%, 7.8% and 5.48%, respectively, compared to conventional irrigated plants.
On the other hand, the effects of irrigation water salinity on all traits except oil percentage, oil yield and harvest index were significant at 1% level. However, the interaction between type of water and salinity on any of the measured traits was not significant. Salinity reduced seed yield. The highest seed yield and irrigation water productivity were observed at 4459 kg/ha and 0.73 kg/m3 for grain yield in salinity S1 (control treatment). Application of salinity of 4 and 6 dS / m (S2 and S3) caused the seed yield to be reduced by 9.3 and 21.8% in comparison with the control treatment, and also irrigation water productivity for the biomass yield was 14.57 and 29.23% decrease.
According to the results of this study, the use of magnetized water can reduce the effects of salinity stress in conditions of applying salt stress.

sustainable management of water resources is necessitated in the regions increasingly confined by water resources or mismanagement leading to shortages of water, or water quality deterioration. Much of the volume of water consumed in Iran belongs to agricultural sector which due to the decrease in fresh water sources and putting Iran within the world water crisis countries, control and optimization of water use is required in order to solve this crisis. The use of unconventional waters is one of the influential ways to solve this matter. The aim of this study was to investigate the possibility of reusing drainage water produced in agriculture in successive cultures (serial irrigation) and to determine the efficiency of this irrigation on yield, plant yield components of soybean and sunflower and water use efficiency in the entire system. The research was carried out in 2014-15 year at the research farm of Shahid Chamran University, Faculty of Water Sciences Engineering in the three plots A, B and C, each respectively with the area and cultivation of 380m2 and corn, 100m2 and soybean and 36m2 and sunflower. Drainage water generated in the first phase (plot A) was used for plot B irrigation and that produced in the second phase (plot B) was used plot C irrigation. Plot A as a drainage water producer and to determine whole system efficiency and B and C plots to determine the effect of irrigating with drainage water as well as different levels of nitrogen on yield, yield components and system’s water use efficiency were considered. The experimental design used in plot B, split plots were chosen in a randomized complete block design which irrigation management factor at two levels (irrigation with Karun river water and drainage water) as the main factor and nitrogen levels in three levels (50%, 75% and 100% of nitrogen fertilizer supply) as a secondary one with three replications were taken into account. Also in plot C, experiment was implemented as factorial 2*2 in a randomized complete block design with two factors of irrigation management at two levels (irrigated with Karun river water and drainage water) and nitrogen levels (50 and 100 percent of nitrogen fertilizer supply) with three replications. At the end of the growing season, after analysis of measured data, results demonstrated in plot A, corn plant had suitable seed and biological yield and it can be used to determine the performance of the whole system. In plot B and soybean cultivation, results showed that using drainage water as irrigational water had no yield reduction compared to irrigation water Karun River and drainage water generated in the first stage can be applied as irrigation. Also, the effect of different levels in both irrigational treatments was significant and increasing the amount of nitrogen led to yield increase and its components. Using drainage water caused to the yield loss slope reduction for reducing the amount of nitrogen received. The quantities of biological yield in using drainage water and Karun River water as irrigation water was obtained 12902.022 and 13496.982kg per hectare, respectively which are high values for determining the whole efficiency of serial irrigation system. In plot C and sunflower plant cultivation, using drainage water as irrigational water affected yield and its yield components in 1% and 5% levels. As well as, different nitrogen levels also have an impact on the yield and as plot B, irrigation with the use of drainage water has shortened the slope of yield reduction. Maximum and minimum degree of irrigation management effect and using drainage water were seen respectively on grain yield and plant height. The amounts of reduction in grain yield and plant height in irrigating with drainage water versus Karun River water were 21.9 and 7.85%; which its main reason could be dated back to the lack of underground drainage system in the plot C to be leaching the soil profile. Sunflower cultivation observations revealed the impact of irrigational water salinity on grain yield greater than biological one. So that, this reduction was acquired 13.25% in biological function. According to the results in plot C and sunflower cultivation, 13.25% of product reduction was seen with the use of drainage water that this amount is negligible relative to the significant increase of water productivity. Results showed the superiority of the serial irrigation systems compared to normal irrigation in saving water in the desired quality at a rate of 45.59% and water productivity increase by at least two folds. As a result, the use of serial irrigation systems and sequential use of drainage water as irrigational water exhibited very good results in increased productivity and the amount of production per water consumed.

 Successful irrigation system accomplishment in a region is related to factors such as climatic conditions, water quality, topography condition, soil specifications, production variety and socio-economic factors. In this study a procedure has been expanded and introduced to scoring the effective factors in order to selection of irrigation systems. This coefficient on the base of special condition is determined by analytical hierarchy process. By analytical hierarchy process in corporation with geographical information system (GIS), this weight has been multiplied by the data layers. Final scores are provided by algebraic summation of each factor from scores of each region. In this research potentiality of irrigation systems for 11080/5 hectares of Izeh Plain in Khuzestan province is performed and results are shown as maps with scores of each region of plan area for each irrigation system. According to the results of the compilation layers and final map, layer of low pressure irrigation system with covering 7741.5 hectares and layer of the surface irrigation system with covering 6908.3 hectares of Izeh plain presented as the best irrigation systems for the selected area respectively.