CHEMICAL COMPOSITION OF CITY WASTE WATER AND ITS EFFECTS ON GERMINATION OF TOMATO AND MUSTARD

Abstract

Waste water samples collected from Shyama Shundori of Rangpur City from the Rangpur Sadar Upazilla, Rangpur and analyzed for its quality and suitability for agricultural purposes. Analyses included pH, EC, temperature, alkalinity cations (Ca2+, Mg2+, Na+ and K+ ), anions (Cl- , HCO3 - , PO4 2- and SO4 2- ) and TDS (total Dissolved Solids). Several variables such as SAR (Sodium Adsorption Ratio), SSP (Soluble Sodium Percentage) and hardness were also computed. The waste water were found acidic (pH varied from 6.90 to 6.95) and could be suitable for agricultural and aquatic uses. Waste water samples contained Ca2+, K+ and Na+ as the dominant cations and HCO3 - and Cl- were the dominant anions. According to TDS and SAR value, all samples were classed as „low‟ alkalinity hazard. The soluble sodium percentage (SSP) of all water was under „excellent‟ and 'good' classes. All samples were within “very hard” class regarding hardness. Based on SO4 2- , Cland PO4 2- all canal waste water samples were within the 'safe' limit for irrigation. The negative relationships were recorded among pH-EC, pH-TDS, pHK, and Mn-Kelly‟s ratio demonstrated the negative relation. This reflected a negatively significant relation between the above conditions. In contrary EC-TDS, EC-Mg, EC-K, EC-HT, TDS-Mg, TDS-K, TDS-HT, Ca-HT, Mg-K, Mg-HCO3, Mg-HT, K-HCO3, K-HT, Na-HT and Mn-HCO3 showed that positive relation. Germination test, shoot and root length of Tomato and Mustard seeds using different doses of waste water samples were also performed. The highest germination of tomato and mustard seeds were found 97.6% and 89.6% treated with 7 ml and 5 ml of waste water sample. Shoot and root length of tomato and mustard seeds were found 7.20 cm, 6.09 cm using 10 ml and 5.93cm 5.67 cm also using 10 ml of waste water sample.