FIELD: agriculture.
SUBSTANCE: method implies creation of liquorice plantations on the decontaminating lands. Rhizome cuttings of the 4-5-years-old liquorice with the length of 0.20-0.25 m and diameter of 8-20 mm with 4-6 axillary buds of the common liquorice Glycyrrhiza glabra L. and Glycyrrhiza uralensis Fisch are planted at the depth of 0.16-0.22 m with wide row spacings of 2.1-2.8 m in two mutually perpendicular directions with planting rate of 21500-28600 pieces per hectare. During first two years trickle irrigation of the liquorice plants is carried out along the plant rows with trickle rate of application equal to 2-4 l/hour, the trickles are placed at 0.3-0.4 m from each other in the flexible irrigation pipes cavities. The vegetative mass is closely mown and laid into silage pits during September-October at the end of the third-year growth season of the liquorice and concomitant grass. Yearly at the beginning of the 4th, 5th and 6th years amaranth seeds of Bagryanyj grade are sown directly without tillage at the depth of 0.5-1.5 cm with the row spacing of 0.7-1.4 m and with seeding rate of 8·106-12·106 pieces per hectare. Yearly in August the vegetative mass of liquorice and amaranth is mown and crushed with following laying it into the above silage pit. Each 0.3-0.6 m layer of the ensiling mass is treated with saline solution of natural mineral bischofite with the density of 1.1-1.3 t/m3 with the rate of 200-400 l per ton of raw ensiling mass. From the 8th year on the liquorice root is gained at the depth of 0.4-0.6 m. Liquorice roots and rhizome are digged out to the daylight in strips 1.1-1.6 m wide in the direction of the liquorice cuttings planting. Virgin zone 0.6-0.8 m wide is left between the strips as a reservation zone for the liquorice population renewal by regeneration of roots in the treated strips and penetration of new roots out of the reservation zones. The liquorice root mass is subject to extraction, unmarketable parts of the liquorice roots and rhizome as well as extraction production wastes are mixed with ensiling mass of the liquorice and amaranth in the pits. In autumn the obtained organic fertiliser is applied to the surface of the treated strips when digging out the root mass. Upper soil layer in each strip is milled up to agronomically valuable soil aggregates by tillers at the depth of 0.10-0.16 m and packed by water-filled rollers with the pressure of 0.16-0.32 MPa. In a year secondary digging out of the liquorice root mass is carried out in the other direction of the liquorice cuttings planting.
EFFECT: method allows including contaminated lands around industrial plants into economic rotation.
24 dwg, 21 tbl
