Analysis of the Monthly and Annual Change of Soil Moisture and Evaporation in Iraq

The aim of this research is to know the relationship between surface soil moisture with real evaporation in Iraq during the 30 years period (1985-2014) in eight different stations (Mosul, Sulaimaniya, Tikrit, Baghdad, Rutba, Kut, Nukhayib, and Basrah) through the use of performance data to the National Oceanic and Atmospheric Administration (NOAA) and take advantage of the simple linear regression and the regression test and Spearman rho. The research shows Monthly and annual averages of real evaporation and surface soil moisture and the strong relationship is directly proportional to the evaporation and surface soil moisture and there is high correlation in the stations (Basrah, Kut, Nukhayib, and Rutba) while there is a medium correlation in the stations (Baghdad and Tikrit) and there's a low correlation in the stations (Sulaymaniya and Mosul).