ASSESSMENT OF SEASONAL FLUCTUATION OF NUTRIENTS IN THE WATER AT DIFFERENT LOCATIONS OF KALAPARA UPZILA IN BANGLADESH

Water quality may be varied from season to season. For developing a nutrient management strategy, chemical properties of the water in summer, rainy and winter seasons were observed in Kalapara upazila, Bangladesh in 2019-2020. The samples were analyzed for pH, EC, TDS, P, K, Na, Ca, Mg and S. The maximum water pH, EC, TDS, Ca, Mg, Na and K were found in the winter season and the minimum values were observed in the rainy season. In summer season, the water pH, EC, TDS, Ca, Mg, Na, K, P and S values ranged from 5.80-7.95, 245-1595 μS/cm, 156.80-1020.80 mg/L, 11.46-54.24 ppm, 11.33-45.39 ppm, 156.0-3872.35 ppm, 19.49-98.74 ppm, 0.142-0.789 ppm and 13.00-54.64 ppm, respectively. In rainy season, water pH, EC, TDS, Ca, Mg, Na, K, P and S values ranged from 5.20-6.94, 112-1150 μS/cm, 71.68-736 mg/L, 10.23-51.25 ppm, 9.25-40.46 ppm, 40.21-381.22 ppm, 10.26-36.93 ppm, 0.326-2.610 ppm and 13.90-74.80 ppm, respectively. In winter season, the water pH, EC, TDS, Ca, Mg, Na, K, P and S values ranged from 6.30-8.10, 406-2852 μS/cm, 259.84-1825.28 mg/L, 13.12-69.07 ppm, 12.59-61.99 ppm, 163.63-4048.97 ppm, 21.46-99.55 ppm, 0.261-1.120 ppm and 8.20-44.60 ppm, respectively. Among the seasons, the nutrients content in water were the highest in winter season.