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A direct and secondary effect of liming and organic fertilization on the cadmium content in soil and in vegetables was examined. Celeriac (Apium graveolens L. var. rapaceum) was cultivated in the first year after lime application and organic fertilization whereas leek (Allium ampeloprasum ssp. porrum J. Gay) was grown in the next year. Soil was limed with a calcium carbonate fertilizer at the rate of 2.0 t CaO/ha. The following were applied as organic fertilizers: farmyard manure (60 t/ha), rye straw (4 t/ha), rye and winter vetch, both the plants cultivated as winter catch crops for green manure. Liming significantly reduced the available cadmium content in the soil in the first and second year after its application. Also, it significantly reduced the cadmium content in celeriac and leek compared with no-liming cultivation. Organic fertilization, especially farmyard manure and straw, significantly reduced the soil available cadmium content as compared to the untreated control (without organic fertilization). The aforementioned factor significantly reduced the cadmium content in the examined vegetables. Cadmium lowest content in celeriac leaves and leek was recorded after the application of farmyard manure. A combined application of liming and organic fertilization in the form of farmyard manure most beneficially influenced celeriac leaves with respect to their cadmium content.

Direct and secondary effect of liming and organic fertilization on cadmium content in soil and in vegetables