Two field experiments were conducted on sweet pepper plants (cv. California Wonder) during the consecutive summer seasons of 2006 and 2007, at El-Qaten region, Hadramout Governorate, Yemen. The objective of these experiments was to determine the effects of nitrogen fertilization rates (60, 90 and 120 Kg fed^-1) and their application systems (three, four, five and six split doses), on vegetative growth, and fruit yield of sweet pepper. The obtained results indicated that increasing N applied rate was accompanied with significant increases in plant height , number of leaves , leaf area and dry mass plant ^-1 .Moreover, higher yield potential (yield plant ^-1, number of fruits plant^-1 and average fruit weight^-1) seemed to be associated with the application of 9o kg N fed ^-1 . Increasing number of split N applications up to six split doses, significantly , increased vegetative growth characters ; plant height, number of leaves , leaf area and dry mass plant ^-1. Total fruit yield plant^-1, number of fruits plant^-1 and average fruit weight characteristics were positively and significantly responded to the frequent N applications up to 5 or 6 doses. However, early yield was significantly decreased. The interaction between N rates and their application systems reflected significant differences for most of the studied characters, and revealed that the rate of 9o kg N fed^-1 applied at six split doses; at transplanting, 4,6,10 and 12 weeks after transplanting, appeared to be the most effective combination treatment, which favored the production of high yield.