EFFECT OF HEATING OIL AND NEUTRALIZING SUBSTANCES ON THE CONTENT OF SOME TRACE ELEMENTS IN SOIL

The purpose of the present experiment has been to determine the effect of increasing rates of heating oil (0, 5, 10, 15 and 20 g kg(-1) of soil) and neutralizing substances (nitrogen, compost, bentonite, zeolite and calcium oxide) on the content of copper, zinc, nickel and iron in soil. The effect of incrementally higher doses of heating oil and alleviating substances on the content of the analyzed elements in soil was varied. Higher rates of heating oil caused an increase in the content of copper in soil, a decrease in the content of nickel and iron and failed to produce an unambiguous effect on the -content of zinc. All the tested alleviating substances introduced to soil contaminated with heating oil only slightly reduced the content of copper and iron in soil compared to the series without amendments. In the series with calcium oxide, the highest content of both metals in soil was determined. The content of nickel in soil after the application of each of the tested neutralizing substances as well as the content of zinc in soil amended with nitrogen, zeolite or calcium oxide rose compared to the control (without amendments).