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The study was conducted on a podzolic soil (originating from a field experiment), fertilized with various doses of municipal-industrial sewage sludge, i.e. 30 (1%), 75 (2.5%), 150 (5%), 300 (10%) and 600 Mg ha⁻¹ (20%), and then planted with willow (Salix viminalisL.). In the third year from setting up the experiment, in two layers of the soil (0-20 and 20-40 cm) determinations were made on the effect...
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