A drip irrigated cotton experiment was conducted for three years during which six water levels and five nitrogen levels were used. Yield was highly influenced by amount of water. Nitrogen-level had less influence on yields. After the three-year experiment was completed, soil samples were taken to seven foot on the experiment's thirty sub-treatments. The samples were analyzed for nitrate- and ammonium-Nitrogen. Overall, residual nitrate decreased as water application rates increased, but surprisingly, little relationship existed between amount of fertilizer applied and residual nitrogen.