Managing the Saline Irrigation Water to Decrease Water Gap Under Climate Changes Effects

The use of salt water for irrigation purposes has become widespread in the last fifty years, as it is available in many countries.The use of saline water as drainage water and saline groundwater is increasing because of climate change effects on both the quantity and quality of irrigation water, especially in arid and semi-arid areas.This research examined the effect of effective rainfall and leaching fraction on the productivity of four strategic crops when irrigated with medium salinity water from two different sources, groundwater was approved from two wells with a salt concentration of 5.43 dS m -1 , and 8.39 dS m -1 .Understanding the relationship between saline water use and relative yield under various field conditions of climate change, like effective rainfall ratio and leaching fraction, is very important to expand using saline water and decrease the water gap between demand and available water resources.A computer program was built to estimate the productivity of wheat, barley, maize, and cotton when irrigated by each of the two water sources mentioned under three values of leaching fraction and four ratios of effective rainfall.It was noticed that crop productivity is associated with a linear relationship with rainfall ratios, and nonlinear relationships with leaching fraction, as climate changes affects both the rainfall depth and the water quality, these relationships of crop yield must be taken into consideration for managing the agriculture projects in arid zones.