The role of climate in Variation  to the values of Potential Evapotranspiration in the southern region of Iraq.            (Using the program CROPWAT 8.0)

	The role of climate in Variation to the values of Potential Evapotranspiration in the southern region of Iraq. (Using the program CROPWAT 8.0)
Alustath
Article 1, Volume 2, Issue 208, 2018, Pages 325-356
Abstract
Affected by of Potential Evapotranspiration climate all elements of the solar radiation, and the actual and theoretical Sun shine, temperatures, winds, and relative humidity. In order to extract accurate data for the of Potential Evapotranspiration in the southern region of Iraq has been the adoption of the equation Penman - Monteith, developed by the Food and Agriculture Organization of the United Nations in the form of a computer program called CROPWAT 8.0, and enter the data elements of climate key was to get rates and totals of Potential Evapotranspiration in the southern region of Iraq, which appeared to be getting increases progress in the south of the study area, while less progress in the north. Also increasingly approach the summer, especially the month of July, and at least close to winter, especially from the month of January. To prove the existence of a causal relationship does not exist between the elements of climate and potential evaportranspiration of Pearson correlation used to extract the simple correlation coefficient between the two variables, the law was also used t-test to see if the correlation coefficient was statistically significant and has a causal relationship or not. As well as the use of multiple correlation coefficient for the extraction of the correlation coefficient between the three variables, the variable in which the first and second elements of climate and the third variable of Potential Evapotranspiration, And Was reached several conclusions contained in the search.

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