ABSTRACT
ABU-QIR bay receives continuous discharge of nitrogen and phosphorus compounds from three main sources, Nile water, El-Maadiya opening and El-Tabia pumping station. their seasonal variation during autumn ainter 1988. spring and summer 1989, the relationship and ratios between inorganic and organic nitrogen and phosphorus are discussed. The nitrogen results show that ammonia the most abundant nitrogenous from [17.31%] followed by nitrate [13.68%] and the least is nitrite [1.45%]. Phosphorus distribution in the bay indicates that 53.5% of the TP is in the form of inorganic phosphorus and 46.5% is organic phosphorus. Nitrogen and phosphorus compounds reached their maximum in winter and their minimum in summer and spring. Total nitrogen/total phosphorus varies from 10 to 28 and NO[3]: PQ[4] ratios vary from 2 to 10