Soil gypsum content was extensively affecting the infiltration rate (Fig. 5). It can clearly be seen from Fig. 5 that infiltration rate vales were decreased exponentially (i = a G−b) with increasing soil gypsum content for each irrigation event. Infiltration rate values were significantly (P < 0.05) decreased with increasing soil gypsum content (Table 5). This outcome was expected because of the solubility of gypsum in irrigation water (about 30 meq l−1) which result’s a rapid soil surface seal formation. Stable infiltration rate values after the first sprinkler irrigation reflects that there is no additional pronounced soil surface sealing and limited (nonsignificant) infiltration rate changes accordingly.