Assessment of lead phytotoxicity in soddy brown soil

Soil cover pollution by superfluous concentrations of lead leads to negative ecological consequences. The topicality of studying of lead in Baikal region is conditioned by the low potential buffer power of the soil cover to heavy metals, the heightened background element content in soils and parent rocks, and also local pollution close to mining and concentrating productions, industrially developed centres, objects of transport and household communications, dumps, etc. In this connection phytotoxicity of growing lead rates (50, 100, 200, 400, 800, 1600, 3200 mg/kg of soil) applied to soddy brown soil has been studied at various (7 and 30 days) composting terms. According to the conducted researches, lead depending on the applied rates showed neutral, stimulating and toxic actions on the parameters of germination and the intensity of the initial growth of wheat. The composting term increasing after lead addition to soil led to weakening of the toxic effect and in certain cases to strengthening of the stimulating action. When studying phytotoxicity of the growing rates of lead at various terms of composting the most informative parameters were the duration of seeds germination, and also the length and biomass of wheat sprouts

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