Wpływ wapnowania i dodatku materiałów organicznych na zawartość niklu w kupkówce pospolitej oraz we frakcjach w glebie zanieczyszczonej tym pierwiastkiem / Effect of liming and addition of organic materials to the nickel content in biomass of cocksfoot and his fractions in soil contaminated with this element

The aim of these studies was to determine the effect of soil contamination with nickel (0, 75, 150 and 225 mg Ni kg-1 soil) on the content of nickel in biomass of cocksfoot and fractions of this metal in the soil under different liming (0 Ca and Ca by 1 hydrolytic acidity) and fertilization with organic materials (without the use of organic materials, straw rye and brown coal from Turow Coal Mine). Four swaths of cocksfoot gathered in the third year of a pot experiment were analyzed and fractions of nickel in the soil after the last swath of test plants were determined. Total nickel content in the plant and in the soil was determined by ICP-AES after earlier mineralization. Fractions of nickel in the soil were determined by sequential fractionation according to BCR procedure. The introduction of nickel into the soil, regardless of amount, significantly increased concentration of this metal in the biomass of cocksfoot and soil in all fractions, in particular the soluble and easily exchangeable fraction (F1). Liming the soil and the application of organic materials decreased nickel content in the biomass of cocksfoot and its soluble fraction in soil, easy available for plants, causing the same time to increase its share in the residual fraction (liming) and oxidisable fraction (the application of organic materials)