Phosphorus and potassium supply to leguminous crops is neces­sary especially at the flowering and setting stages. A 2-year field experi­ment was carried out at Ismailia Agricultural Research Station in 1994/ 95 and 1995/96 growing seasons to evaluate the effect of foliar appli­cation of the supernatant of soaked Ca-superphosphate (SP) and K-sulphate (KS) both at the rate of 5 kg/fed., (5 kg Sp + 5 kg KS) /fed. (10 kg SP + 5kg KS) / fed. or (5kg SP+10 kg KS)/fed. on yield and its components of lentil and lupin as well as seed contents of protein, phos­phorus and potassium. Foliar spray with the solutions of SP at the rate of 5 kg/fed. or the mixture of 10 kg SP+ 5 kg KS/fed. induced significant increases in yield and yield components of both crops during the two growing sea­sons compared to the control, except the lupin straw yield which was not significantly affected by all studied treatments. Foliar application of 10 kg SP + 5 KgKS/fed. was superior to 5 kg SP/fed. in most cases with no significant differences. Both lentil and lupin plants were not signifi­cantly affected by the other treatments except the straw yield and seed potassium content of lentil which showed significant increases due to fo­liar application of KS (5 kg/fed.) and 5 kg SP + 10 kg KS/fed. Seed con­tents of protein and phosphorus were not significantly affected by the studied treatments.