Evaluation of irrigation water quality for paddy cultivation in Bachok, Kelantan

Abstract Evaluation of irrigation water quality status was conducted in Bachok district, Kemubu Agriculture Development Authority (KADA) from July 2021 to March 2022. Water changes the canal were examined by measuring several physical and chemical at eight sampling points. The locations are primary canals used supply into paddy fields. parameter measured temperature, pH, Dissolved Oxygen (DO), Conductivity, Biochemical Demand (BOD), Chemical (COD), Total Suspended Solids (TSS), Ammoniacal Nitrogen (AN), Ca, Na Mg. This paper aims discuss using Quality Index (WQI), National Standards (NWQS) Sodium Adsorption Ratio (SAR). results revealed that within NWQS Class II-IV except DO, AN TSS with intensive aquaculture. average all points ranged 66.67-88.18, indicating samples falls category excellent adequate water. SAR values varied 1.66-10.20, which means categorized suitable for purposes. work will help decision makers better manage resources policy development cultivation KADA.