Overuse of farmlands for crop production and rising cost of chemical Overuse of farmlands for crop production and rising cost of chemical fertilizers have grossly affected crop yield, production and food availability, and the search for alternative use of locally available aquaculture-waste for fertilizer and soil improvement can improve crop yield and food availability for the teaming population of Nigeria and other sub-Saharan African countries. This research determined the pH, Organic Matter, nitrate and phosphate qualities of 10 fishpond sediments for use as agricultural fertilizer supplement and soil conditioner in Owerri, Nigeria. Samples were subjected to standard physicochemical analysis. The pH ranged from 8.1-7.3, organic matter from 46.6-61.3 g/kg, nitrate from 2.6-3.2 g/kg and phosphate from 0.05-0.1 g/kg. The higher the organic matter in the sediment samples, the higher the recorded pH, nitrate and phosphate from the different ponds sediments. Organic material, nitrate, phosphate and pH variation in the sediments might be due to nutrients added to pond water from fertilizer, unconsumed feed, fish feaces and metabolites. The nitrate and phosphate are major plant nutrients; organic matter can be used as soil conditioner. The pH can determine the soil chemistry and availability of the nutrients. The fish pond sediment can help to improve soil texture and soil fertility, which may influence soil aeration, water, and nutrient-holding capacity and root penetration by crops and increased crops growth and yield. It can serve as alternative uses for fertilizer, soil conditioner, and its application as a waste management approach in aquaculture for environmental sustainability.