FIELD: soil reclaiming. SUBSTANCE: process for preparation of ecologically compatible soil improvers includes the treatment of lignite earth material with etching waste product containing 15 % H2SO4, 10 % HCl and 4 % urotropin in their weight ratio 4: 2: 1 under stirring for 1 h to give homogeneous mixture. EFFECT: high soil stimulating effect. 4 tbl
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