Drip irrigation on cotton (Goosypium spp.) is a relatively new management technique in Arizona with the promise of reducing water consumption and enhancing yields. We investigated the influence of five drip irrigation treatments on the yields of three cultivars ('DP41', 'DP90', and 'DP77') planted at three seeding rates (5.6, 10.2, and 20.4 kg ha-1). The irrigation treatments in 1985 were 60, 68, 76, 83, and 86 cm of water and in 1986 were 59, 65, 71, 78, and 80 cm applied during the growing seasons. The experiment was conducted on a commercial farm near Eloy, AZ. on a variable Kohall sandy loam (Typic Haplargids) soil. An above ground drip irrigation system was used which had tubes running between every other cotton row with 1 L hr^-1 emitters spaced at 1 m intervals. The driest irrigation treatment resulted in significantly lower yields both years as compared to the other irrigation treatments. The yields indicated that optimal irrigation was approximately 76 cm in 1985 and 65 to 71 cm in 1986. This compares favorably with furrow irrigated cotton in this area which often requires 150 cm of water. There were significant cultivar differences both years but the highest yielding entry in 1985 (DP77) was the lowest in 1986. The two lower seeding rates resulted in better yields as compared to the 22.4 kg ha^-1 treatment. More efficient water use and high yields may be obtainable with drip as compared to furrow irrigation under some conditions.