Abstract
Study was carried out on the influence of metallurgic industrial sludge on morphometric and biochemical indicators as well as productivity of common flax under laboratory and field conditions. In laboratory settings negative influence on seed germinating ability and positive influence on sprouts biomass production in water medium were observed. In sand medium suppression of biological productivity under the influence of sludge together with photosynthetic system II (FS II) activity stimulation were registered. Biochemical study showed peroxidase activity decrease in laboratory, while activity of polyphenol oxidase, superoxide dismutase and catalase were given a mild boost under the influence of sludge. In the field trial, positive influence of sludge on flax photosynthetic apparatus was shown. Positive influence of sludge on vegetation and yield indicators was observed. The analysis of heavy metals content showed excess over maximum allowable concentration (MAC) of copper and zinc in control plants, it may point to the background soil pollution. In the plants from the trial groups receiving 0.5 and 2 ton/ha heavy metals content below the control values was registered. Application of 4 ton/ha led to the maximum content of copper and zinc in the plants among the trial groups. The analysis of soils from the test plots indicated no excess over maximum allowable concentrations of heavy metals. Thus, further study of possibilities of using metallurgic industrial sludge as a soil stimulator in flax cultivation at the application rate of 0.5 t/ha seems promising.
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