EVALUATION OF SURFACE WATER FOR IRRIGATION OF DIGHALIA UPAZILA IN KHULNA DISTRICT OF BANGLADESH

An investigation was conducted to find out the surface water quality and classify them according to their suitability for irrigation in Dighalia Upazila. The water samples from eighteen selected locations were collected and analyzed for pH, EC, Ca, Mg, Na, K, S, B, Zn, Fe, Cu, Mn, SAR, SSP and hardness (HT). The pH values of water indicated neutral to alkaline in nature and chemical analyses of water samples reflected the concentration of most ions were within the safe limit except Mg, Na and K concentration those were higher in surface water than normal concentration. Classification on the basis of EC, SAR and HT indicated safe limit for irrigation and only 22% water samples were within the permissible limit based on SSP for irrigation use.