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The supplied pot experiment was set to assess the relationship between chemical form of Zn supplied to the soil with sewage sludge composted in 4 ways, and the content of this metal in cultivated maize. The composts of only sewage sludge and the sludge with addition of brown coal, vermicompost of sludge as well as the vermicompost of the sewage sludge with addition of coal were applied in doses corresponding...
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