Abstract: The aim of this study is to investigate the effects of N additions (50, 100 and 150 kg ha-1) on ground vegetation 12 months after field experimental establishment. The experiment consists of a control and three levels of N applications in four replicates. Nitrogen was provided as urea and all N treated plots were given 75 kg ha-1 of P. In each plot of 64 m2, two systematically quadrats (2x2 m) were examined. All ground floras in the plot were identified and the percentage covered were estimated. Ground vegetation composition and species richness were not affected by N application. The cover of Ageratum conyzoides increased on fertilized plots while the cover of Borreria latifolia and Asystasia intrusa decreased. Results of this study showed that N addition could influence ground vegetation by improving nutrient availability in the tree stand thus changing light penetration to the forest floor.