Effect of Tillage and Nitrogen Levels on yield and yield components wheat crop (Triticum aestivum L.) In Rice Based Cropping System.A field trial to investigate the response of wheat (Triticum aestivum L.)crop to different nitrogen fertilizer doses and tillage practices at Research Area in Gomal University Dera Ismail khan.The Crop was sown in Nov 2007.The experiment was laid out in randomized completely block split plot design with four replications.Duncan multiple range test (DMRT) was used to compare treatment means.