Interrelationship between bottom soil nutrients and physico-chemical variables in a fresh water impoundment in Northern Bangladesh

摘要

The interrelationships between the bottom soil nutrients (i.e. pH, potassium, calcium, magnesium, iron, manganese, organic matter, nitrogen, phosphorus, sulphur, boron etc.) and the physico-chemical conditions of water (i.e. depth, temperature, transparency, total solid, electrolytic conductivity, pH, carbon-di oxide, bi-carbonate, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, calcium, magnesium content, total hardness, nitrate nitrogen, total phosphate, oxidation reduction potential, oxidation reduction index and soluble salt) in a large fresh water reservoir in the northern part of Bangladesh has been studied. The bottom soil nutrients and the physico- chemical variables of the water body were found to have positive or negative correlation with each other as revealed by correlation analysis. Contents of the physico-chemical variables of the water did not exceed the ISI and USA limit of drinking water quality standard (DWQS) and irrigation water quality standard (IWQS).