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Application of residuals to soil can favor the development of nutrient-poor agricultural areas. The objective of this study was to evaluate changes in the chemical attributes of soil after application of tannery sludge. The applied treatments were 1) Mineral control: 100 kg N ha, applied in different stages (25% at planting and 75% when plant maize was in the 1.4 development stage); 2) tannery sludge: 50 kg ha  ֿ 1; 100 kg ha ֿ 1; 200 kg ha  ֿ 1; 400 kg ha  ֿ 1; and 600 kg ha  ֿ 1 of organic-N. All plots were treated with fertilizer (75 kg ha  ֿ 1 P2O5 and 50 kg ha  ֿ 1 K2O). In the mineral control, nitrogen was applied in ammonium sulphate form. Soil samples were analyzed to determinate pH, calcium, magnesium and aluminum in 1M KCl solution, potential acidity (hydrogen + aluminum in a calcium acetate solution pH 7), and potassium and sodium in a Mehlich 1 solution. The application of tannery sludge modified the chemical attributes of the soil, increasing pH and Na, Ca, and Mg contents. Key-words: Amazon, Disturbed areas, Fertilization, Soil pollution

Changes in chemical attributes of soil treated with tannery sludge in Amazonia