Tow field experiments were carried out during 1999 & 2000 summer seasons at the experimental Farm, Fac. of Agri. At Fayoum ( newly reclaimed sandy soil ) to study the performance and responses of tow peanut cultivars (Giza 4 & Giza 5) to different combination level of NPK fertilizer T1 (15N+20P+25K), T2 (30N+20P+50K), T3 ( 15N+30P+25K), T4 (30N+ 30P+50K), T5 (15N+ 40P+ 25K) and T6 (30N+40P+ 50K ) were tested.
Result revealed significant differences between cultivars concerning the majority of growth, yield, yield components as well as seed oil and protein contents. This keep true also for the effect of NPK fertilizer treatments as well as the interactions between cultivars and fertilization treatments. The two tested cultivars showed different behavior during their vegetative and reproductive growth periods. Except for primary branches at 60 days plant age in the first season as well as plant height at 75 and 90 days age and seed protein content in the both seasons, all the character averages were in favour of V2 (Giza5 ).
T3 (15 N + 30 P + 25 K) and/or T4 (30N + 30 P + 50 K) were the most suitable nutrient combinations for improving growth and yield characters of peanut grown in such soil. The highest yield (2.7 and 3.1 t/fad. In 1st and 2nd season, respectively) with acceptable oil and protein contents were obtained from V2 (Giza5) when fertilized with T4 ( 30N+30P+50K ) treatment. Finally, the data indicated that growing peanut in such newly reclaimed soil under balanced nutrition is profitable.