The effect of amount and salinity of water on soil salinity and growth and nutrients concentration of spinach in a pot experiment

In order to investigate the effect of amount and salinity of irrigation water equal to 0.5, 3 and 6 dSm-1 caused by NaCl (S0.5, S3 and S6, respectively) and irrigation levels equal to 60, 80 and 100% of full irrigation (E 60, E80 and E100, respectively) on nutrients and growth spinach, and also soil salinity profile, an experiment was carried out in the pot in a factorial method as a complete randomized design with four replications. According to the results of the research, salinity and water had effect on plant height, number of leaves; leaf area and chlorophyll index so that increasing salt amount in irrigation water and decreasing water usage leaded to decreasing chlorophyll index, height and number of leaves in the plant. Due to increasing salinity to 3dS.m-1, concentration of P and N had increased significantly and K had decreased to S0.5, insignificantly. Content of P and N decreasing in E60 treatment to E100 was 1.3 and 0.46% respectively and the Content of K increasing was 1.62% which was not significant. Study of soil salinity profile showed that in 0-6 cm soil layer for 3 and 6 dS.m-1 treatments, salinity increased about 23 to 53% to 0.5 dS.m-1 treatment. Due to saline water 6 dS.m-1, soil with the average of salinity is acceptable.