Chlorophyll a and primary biological productivity of groundwater in Alshirqat, Salaheddin province, Iraq

Aims:The current study is designed to determine the chlorophyll a, to calculate the primary biological productivity of oxygen and carbon and plant nutrient (phosphate, silica, nitrite and nitrate) monthly in the groundwater of six wells in the Alshirqat area from October 2021 to March 2022.Groundwater is an essential source of water in Salaheddin province, Iraq.Methodology and results: Water is pumped out by electrical pumps.Samples were taken monthly early in the morning after pumping out water for 10 min from October 2021 to March 2022 with clean polyethylene bottles after washing with the same water several times, depending on sample test requirements.Water and air temperatures were measured at the time of sample taking.The tests were quickly conducted in the College of Sciences, Tikrit University Laboratory.The results clarify the monthly variation of the above properties.Air and water temperature ranged from 3-30 C and 16-25 C, respectively.The plant nutrients (phosphate, silica, nitrite and nitrate) values were 2.51-3.489mg/L, 0.397-6.913mg/L, 0.277-0.697g/L and 5.3-8.7 mg/L, respectively.The range of the chlorophyll a in the groundwater samples, the primary oxygen productivity and primary carbon productivity varied between 0.534-74.844mg/L, 9.43-19.12mg/L and 353.8-716.9g/m 3 /day, respectively. Conclusion, significance and impact of study:The groundwater in the west of Alshirqat, Salaheddin, Iraq rich in plant nutrients (silica, phosphate, nitrite and nitrate) and chlorophyll, with high primary oxygen and carbon productivity.