Field studies were conducted in 1999 and 2000 to evaluate nitrogen fertilizer requirements for ultra narrow row cotton production in Texas. Nitrogen fertilizer rates of 0, 50, 100 and 150 lbs N/acre were applied to UNR row spacings of 15 and 19 inches and a conventional row spacing of 38 inches. Both row spacing and N rate significantly affected plant height. From peak bloom and through maturity, plants were significantly shorter in the UNR treatments compared to conventionally spaced treatments. N fertilizer increased plant height at each growth stage compared to the control, except pinhead square. Plants in conventional rows had significantly greater petiole nitrate concentrations compared to UNR plants across N treatments. UNR row spacing significantly increased lint yield in 1999, but not in 2000 when moisture was very limiting during late bloom and boll fill. Fertilizer N increased cotton lint yields regardless of row spacing in 1999, but no differences were observed among rates from 50 to 150 lbs N/acre. In contrast, fertilizer N did not increase lint yield in 2000.