[Heavy metal content in soils and feed crops of the South Taiga zone]

The research task is to determine intake, consumption and migration levels of the most prevalent heavy metals (HM) in the chain precipitation-soil-plants- ground waters on hayfields and pastures of the South Taiga zone of European part of Russia. The experiments were hold on upland meadows, which were not exposed to industrial pollution. The lysimetric tests were done on monoliths of podzol loamy, sabulous and also alluvial meadow soils. The sown grass stands were cut out 3 times per a season, and 4 grazing cycles were hold on the pastures. The follow fertilizers were applied (kg per hectare): N - 240, P - 60, K - 120 and 400. Every year 300-350 kg of dry matter came into 1 hectare of soil by means of manure effluents. A raised concentration of Zn was found out in the soil 0-0.2 m layer of loamy podzols. Concentrations of Pb, Ni, Cd and Cu were higher in 2-3 times in the plow layer of loamy soil than in the ones of sabulous soil. Migration of Pb and Cd into a depth of 0.5-2 m was noted. Dactylis glomerata accumulated HM more than all other pasture species. HM concentration there approached 33.8 (Zn), 9.0 (Cu), 0.3 (Pb) and 1.9 (Ni) milli g per kg. Phleum pratense accumulated intensively in Cd (up to 0.18 milli g per kg). HM content in grass fedds depended more on soil acid capacity than on HM content in the soil. HM crop removal was higher off loamy soil than off sabulous one. Organic fertilizer applying for the loamy soil resulted in higher chemical removal, but that low was noted for the sabulous soil only in the relation with Cd. Grass of multiple cutting haymaking contained less Zn and Cu than pasture grass. The difference was 13% and 40% at fertilizer absence, it was 35% and 38% against mineral fertilizer background and it was 44% and 25% against organic-mineral one respectively. So, the conclusion is made that HM content in feeds depends more on composition of grass stand species than on a soil type and its granulometric composition.