Evaluation of crop response to phosphorus (P) fertilizers is an important part of developing an efficient fertilization program. This long-term study was conducted to determine P requirements of short-season cotton using the acid-base fertilizers urea phosphates, (UP and UUP). Response to P was compared at N rates of 20, 40 and 80 lb n ac^-1. Phosphorus rates were varied at 0, 20, 40 and 80 lb P₂O₅ AC^-1. Cotton (Gossypium hirsutum L.) was grown under dryland conditions from 1978 through 1990 on an orelia fine sandy clay loam (Typic Ochraqualf). There was a significant average yield response to 20 lb P₂O₅ Ac^-1 for the first five years where N was supplied at 80 lb N Ac^-1. Responses to higher rates (40 and 80lb P₂O₅ Ac^-1) were generally not significant. Tissue P generally increased with applied P fertilizer when N was supplied at 40 and 80 lb N AC^-1. Linear correlations between leaf P and lint yields were sparingly significant for specific N rates and seasons.