Impact of irrigation regimes on salinity pattern in soil under subsurface drip irrigation

Irrigation management is effective on soil salinity variation. Salinity pattern was studied in different soil layer under different irrigation regimes in a pistachio garden equipped to subsurface drip irrigation system. The treatments were three irrigation regimes; control (I1), Irrigation based on irrigation requirement (I2) and I2 plus leaching requirement (I3), three soil depth of 25, 50, and 75 cm from soil surface and before and after irrigation event. According to the results soil salinity change by irrigation regime, time and soil depth layer. The I2 irrigation regime were more effective to move the salinity (ECe) to margin of wetted zone compared to other irrigation regimes. Salinity increased by soil depth and that was higher in 75 cm soil depth with 14.5 dS/m. Irrigation regimes were not effective in moving the salinity to upper part of dripper lateral line. Bilateral impact of irrigation regimes, soil depth, and time before and after irrigation event was also resulted in higher soil salinity in 75 cm soil depth with 14.2 dS/m. The I3 irrigation regime applied more salt to the soil by higher irrigation depth but was not effective to leach out the salt.