Journal of Geology & Geophysics
Open Access
ISSN: 2381-8719
ISSN: 2381-8719
Ch Sreenivas, P V Satyanarayana and P Rajendra Prasad
Acharya N G Rang Agricultural University, India
Andhra University, India
Posters & Accepted Abstracts: J Geol Geophys
Lake Kolleru is the largest freshwater wetland ecosystem in South India. Presently, lake environment is at stake due to conflicting interests of agriculture and aquaculture. Hence an attempt was made to assess water quality of Kolleru Lake, aquaculture ponds, agriculture drain and their role in lake water quality. The methods of study broadly confined to field and laboratory investigation. Monthly water samples were collected from selected 30 bench mark sites from January, 10 to December, 10 covering Kolleru lake area and Upputeru river estuary. The Total Cations (TZ+) and Total Anions (TZ-) balance show the charge balance error percentage. The error percentage is between �?�1% to �?�10% with few exceptions for certain ions. Sodium is the major cation (61.5%) followed by magnesium (19.9%), calcium (16.7%) and Potassium (1.9%). Whereas, among the anions chloride is the major anion (47.4%) slightly followed by bicarbonate (40.4%), sulphates (11.8%) and carbonates (0.5%). Monthly water quality maps were prepared using surfer software to know the spatial variability. Cations and their ratios were used for assessing temporal variability. Water samples were collected from selected 25 bench mark sites each from Kolleru lake, aquaculture ponds and agriculture fields in and around Kolleru lake. Average salinity of water is more in aquaculture ponds (1480 μmho/cm) fallowed by lake water (939 μmho/cm) and lowest with agriculture (675 μmho/cm) but all are not suitable for drinking purpose. Eutrophication potential (PO-2 4) is found to be six times higher in aquaculture ponds (0.06 me/l) followed by Kolleru lake (0.03 me/l) than agriculture (0.01 me/l). Mean total bacterial count (�?104) is higher in lake (10.87) than aquaculture ponds (2.33) and agriculture fields (1.33). Whereas, fungal count (�?103) is highest in aquaculture ponds (8.67) followed by agriculture fields (7.3) and lake (6.38).
E-mail: csvasu@yahoo.com