Abstract
The waste water generation from the automobile motor workshop activities are responsible for environmental degradation in the form of water pollution and showed variable impact on plant growth. This paper gives information, assessment and screening about the effect of motor work shop waste water on seedling growth of two different types of legume bean crops namely, kidney bean (Phaseolus vulgaris L.) and mung bean (Vigna radiata (L.) R. Wilkczek) in pot culture experiments. The results showed that the increase in treatment of 25%, 50%, 75%, and 100% of motor workshop waste water decreased the root, seedling length, number of leaflets, shoot, leaves dry weight and root/shoot ratio of common bean as compared to control. The waste water treatment of 25% significantly (p<0.05) decreased root growth performance and leaves dry weight of common bean as compared to control. The treatment of polluted water produced beneficial and harmful effects on root, shoot length, seedling size, number of leaves, leaf area and biomass production of mung bean. The treatment of waste water at 25% significantly (p<0.05) decreased shoot length, leaf area, shoot dry weight, specific leaf area and leaf area ratio as compared to control. Increase in concentrations of polluted water at 50% significantly effects seedling length, specific leaf area and leaf rea ratio of polluted water on mung bean. The seedlings of P. vulgaris and V. radiata tested different percentage of tolerance to waste water treatment and found high in control treatment. The results showed that seedlings of P. vulgaris showed lowest (32.59%) percentage of tolerance to high concentration (100%) of polluted waste water treatment of workshop. The treatment of polluted water at 25, 50, 75 and 100% decreased the tolerance indices values in seedlings of V. radiata by 104.35, 83.37, 67.63 and 63.16 percent as compared to control. The decrease in seedling growth of growth parameter of P. vulgaris in this study revealed that it was might be due to abiotic stress produced by waste water. The chemical analysis of waste water showed gradually increase values of pH (7.61-9.32), electrical conductivity (0.56-2.62 mScm-1), chloride (13.60-50.96 mgL-1) and CaCO3 (45.90-65.21 mgL-1) as compared to control.
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