The present research was carried out to evaluate response of sweet pepper (Capsicum annum L.) to
plant density and nitrogen fertilizer under field conditions. Plant density at four levels (20×50 cm, 30×50
cm, 20×100 cm and 30×100 cm) and nitrogen treatments at four levels (0, 50, 100 and 150 kg N/ha) were
applied. Plant height, lateral stem number, leaf chlorophyll content, yield, and vitamin C were assessed
at immature and mature stages. The results showed that vegetative growth characteristics (plant height,
lateral stem number and leaf dry matter) and reproductive factors (fruit volume, fruit weight and plant
yield) decreased with increasing plant density, but total yield (kg/ha) increased with increasing plant
density. The highest and lowest total yields were obtained by plant density 20×50 cm and 30×100 cm
respectively. Nitrogen fertilizer was significantly affected on plant height, lateral stem number and leaf
chlorophyll content. It was observed that fertilization with 50 kg N/ha resulted to the highest fruit volume
and plant yield. There were significant differences between fruit volume and fruit weight by interaction
between plant density and nitrogen treatments