FIELD: agriculture. SUBSTANCE: soil is treated by mulching with peat crumble that is stirred preliminary with calcium compounds. Ammonium lignosulfonate is added to peat additionally at amount 0.02-0.5 weight% (as measured for absolutely dry matter) followed by stirring. Calcium compound is calcium carbonate that is added at amount calculated by the formula: 
where 
- dose of CaCO3 per 1 t peat, kg; Hh - hydrolytic peat acidity, mg-equiv./100 g; W - relative peat moisture, %; md.l - ammonium lignosulfonate mass as measured for absolutely dry matter, kg/t. EFFECT: improved method of treatment. 3 cl, 1 tbl
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