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Agriculture is backbone of Pakistan and major part of agriculture is reliant on irrigation through the rivers especially Indus river..The monsoon precipitation is the salvation of Pakistan that provides the country power system and water for the agricultural crops.The focus of the present study was to evaluate the performance of the OILCROP-SUN model and to determine the effect nitrogen (N) on sunflower for three contrasting environments differing in weather parameters (precipitation,temperature and solar radiation).