A field study was conducted on clay loam soil at the Agriculture research institute, Swat during Kharif 2012. Main objective of the study was to determine the yield response factor on maximum, optimal and minimum irrigation levels of soybean varieties, using two varieties (swat 84 and malakand 96) having four replicates and four irrigation levels. Crop water prodcuctivity were were determined from crop yield divided Seasonal water applied. CWP was recorded minimum 0.58 kg m-3 for (swat 84) varieties V1 and maximum 0.82 kg m-3for V2 (malakand 96) varieties (Table 1). Mean of I40, I60, I80, I100 were 0.58,0.62, 0.71 and 0.75 respectively. Lower CWP values of V1 and highest value for V2 were determined.Hence it is concluded that among both the varieties V2 performed better on irrigation two (V2I4), therefore this strategy is recommended for irrigated areas of Khyber Pakhtunkhwa, Pakistan Keywords: Deficit irrigation, Irrigation levels, water productivity, soybean
