SOME ASPECTS OF THE ECOLOGICAL RECOVERY OF THE STERILE DUMPS FROM MEHEDINTI MINING ENTERPRISE PUBLISHEDRomulus Mocanu, Ana Maria Mocanu
The researches made on the ecological recovery of the sterile dumps from Mining Enterprise of Mehedinti, Husnicioara quarry have had as goal the capitalisation of these lands that were degraded by surface mining in order to extract lignite; with this domain there are not any researches so far. The researches that unfolded on these sterile dumps are quite new and these sterile dumps are different in comparison with the ones from Gorj District due to their sandy texture. The material and the researching method have consisted of: the identification of the main soil types; the study of the physical and chemical features of these soils; field experiments with different crops in order to increase the organic matter content; trials with manure and chemical fertilizers; trials with different woody species and crops. Accounting the physical and chemical features of these terrains that are not favorable for plant growing the main objectiv of the research was to increase the organic matter content. The using of organic and chemical fertilizers have had a high importance for the different crops on the sterile dumps. Without fertilizers the wheat and corn crops do not grow at all. Among the fertilizers that were used, the best results were given by: manure, urea, organio-mineral fertilizer on lignite base. The sunflower grows on the sterile dumps with no fertilizer yet with very low yields. The pulses are beneficial on the sterile dumps and among them the alpha-alpha gives the best results: 861 kg hay/ha with no fertilizer and 4.717 kg hay/ha with 25 t/ha manure + N96P64. Along with this crop the peanuts and chickpea can be cropped on the sterile dumps. On the sterile dumps from Husnicioara Mehedinti there have grown well acacia and poplar. The paper is new, original and very important for solving the problem of ecological recovery of the sterile dumps.
open cut mining; lignite; coal basin; mining technical fitting out; biological recovery; fertilizers; compost