One hundred mature swin lagoons were studied and analyzed for: toal nitrogen, ammonia nitrogen, electrical conductivity, total solids, phoasphorus and potassium. Deep lagoons (20-25 ft) has average TKN levels of 1373 mg/L while shallow lagoons (8-12 ft) had TKN levels of725 mg/L. The study also found the variability of niotrogen and electric conductivity to be greater in shallow lagoons than deep lagoons. Deep lagoons exhibited nitrogen levels approximately twice that of shallow lagoons The coefficient of variation values for deep and shallow lagoons indicate significant risk in planning land receiving areas based on average lagoon nitrogen or phosphorus levels. Ammonia nitrogen/TKN levels are approximately equal for deep and shallow lagoons. Surface area to volume ratio appears to strongly influence the equilibrium concentration levels of nitrogen in deep versus shallow lagoons. N/P/K ratios for lagoon effluent and typical mid-west United States crops suggest phophorus will be over applied in most cases when nitrogen is used as the limiting factor. Selection on phosphorus as the limiting nutrient factor will increase thje land use requirements by a factor of 1.3 to 2.8 depending on the crops being grown.