The layout of the plots within the recultivated site. Plots № 1-30 −box sections (each of 1 m²) with substrates of sand and drilling waste; No. 31-40 − box sections of 1 m² with substrates of sand and peat, to which the drilling waste was added in 2004 and which were temporarily used for growing vegetables; No. 41-61 − box sections of 1 m² with substrates of sand, peat and drilling waste; No. 62 − section of 50 m² with a sand substrate; No. 63 − section of 50 m² with a substrate of sand and drilling waste; No. 64 − section of 50 m² with a peat substrate; No. 65 − section of 50 m² with a substrate of sand and peat.