Supply response of major crops in Kerkuk province of Iraq

In this study, supply functions (in responce) of some important plant corps grown in Kirkuk province of Iraq for the period 1994-2015 were examined. In this study, the cultivation area was taken as the dependent variable. As independent variables. (wheat, corn, cotton) as the main factors affecting it and to know. the current price of the product, the current price of the competing product, productivity risk (price risk only for cotton), irrigation water (rain water only for wheat crop) and (Dummy Variable). In order to avoid the problem of incorrect regression, the presence of the unit root among the variables used in the study was determined using the extended Dickey Fuller (ADF) test and a Philips-Peron (PP) test was performed against deficiencies to confirm the results. Since the variance is autocorrelation, the variables of the time series in the effectiveness of the ADF test were not stable in the yield risk levels for the planting area for the wheat crop, the current price of the product, the current price of the competing product, the cultivation area for the corn and cotton products, the current price of the product, the current price of the competing product and the price risk of the cotton crop and that all the variables settled at the first difference.