IONIC CONSTITUENTS AND CHEMICAL PROPERTIES OF SURFACE AND GROUND WATER OF TARAGANJ UPAZILLA IN RANGPUR DISTRICT FOR IRRIGATION USE

Abstract

Water samples were collected from shallow, deeptubwells, ponds and river from Taraganj Upazilla under Rangpur District under the Agroecological Zone (AEZ) no. 3 viz., Tista Meander Floodplain to evaluate their quality. Fifty samples were collected from ground and surface sources to study its ionic constituent and chemical prosperities and also to classify them according to their comparative suitability for irrigation purpose. The chemical analysis included pH, TDS, anions (HCO;, POs and SO and cations (Ca, Mg, Na, K, Mn, Cu, Fe and Zn). All water samples were acidic in nature ( i.e.pH 6.5-6.9) and were not problematic for crop production. Water samples were excellent and good in quality based on SAR and SSP. As regards to TDS all water samples were rated as fresh water. In some water samples HCO; and Mn ions were not Suitable for irrigation. The detected concentrations of Zn, Cu and Fe were below the toxic levels and might not pose threat to soil systems as irrigation water. All the collected samples were not hazardous for irrigation on the basis of TDS and SO, concentration. The relationship between water quality parameters like TDS, SAR, RSC, Hr and SSP were established. Dominant synergistic relationship was observed between MgHCO; and SAR-SSP. The correlation between major ionic constituent like Ca, Mg, K, Na, Zn, Mn, HCO3, SO4 and PO, differed significantly.