ROLE OF MINERAL FERTILIZATION IN ACCELERATING THE BIOREMEDIATION PROCESS OF A SOIL POLLUTED WITH CRUDE OIL PUBLISHEDAnca Rovena Lăcătuşu, Radu Lăcătuşu, Mihail Dumitru, Mihaela Lungu
A field experiment for bioremediation of a crude oil polluted soil was limited on a Stagnic Vertic Luvosols to the Albota - Arges County. The bioremediation in situ experiment included agronomical and microbiological techniques. For this has been set a controlled pollution of soil from the experimental site, up to 5% volume of crude oil in the volume of soil, on the 20 cm depth. Experimental factors were: treating the crude oil-polluted soil with limestone amendments to reduce the acidity level (6 t/ha CaCO 3 ); deep scarification of soil up to a 40 cm depth in order to improve the regime of ear and water circulation in soil; organic fertilization with 150, and 300 tons/ha of stable manure fermented, chemical fertilization with NPK and, soil inoculation with selected micro organisms. The results presented further relates the importance of mineral fertilization with different doses of NPK ratio on the decontamination of crude oil polluted soil, exclusively referring to variants in which the only measure applied to soil was mineral fertilization with doses up to 200 kg N/ha, 200 kg P/ha and 100 kg K/ha. The experimental data show that for this type of soil, heavily polluted with crude-oil, application of mineral fertilizers with NPK is a prerequisite for initiating the processes of degradation and biodegradation of petroleum hydrocarbons. Optimal doses of mineral fertilizers established in the experiment, this supported by the disappearance of pollutants in soil and production results obtained, are 200 kg / ha nitrogen, 100 kg / ha phosphorus and 100 kg / ha potassium.
crude oil; bioremediation; mineral fertilizers