Testing three nitrogen rates for two planting dates on Giza 80 cotton cultivar grown in middle Egypt. For early sowing, nitrogen rates had little effect on plant growth, yield components, yield and earliness. For late sowing, increasing nitrogen rates increased plant growth, while it decreased yield components, ealiness and significantly the yield of seed cotton. The lower nitrogen rate, 112.5 kg/ha proved to be sufficient for producing higher yield for both early and late sowings, in semi-fertile soils.