Study of salt distribution of point sourceand ponding source drip irrigation

Proper management of saline soils needs adequate information about the amount and salt distribution in the root zone. Irrigation of the factors that control the distribution of salt. This paper investigates salt distribution under two sources of dripper and bubbler. This study based on the evaporation of soil surface of a land without plant located at shahid chamran university، Ahwaz، Iran. Samples were taken from three distances 0، 20 and 40cm from the soil surface and 0-20، 20-40، 40-60 and 60-80 depths. The results showed that، the average salinity of bubbler were 12. 75 dS/m that less than drippers with 13. 64 salinity respectively. Among measured depth، the depth of 20 – 40 cm was known as the best working depths، the depth of 60-80 cm had the most salt with salinity of 15. 76 dS/m. depth of 0-20 cm (with the average salinity of 12. 53 dS/m includes more salinity than the depth of 20-40 with the average salinity of 11. 48 dS/m. Soil salinity decreased by time pass and irrigation until the last irrigation، soil salinity under the dripper reached) with salinity of 3. 62 dS/ m) to 1/15 and under the bubblersalinity of 3. 99 dS/ m) to 1/14 of the initial amount.