The residues flue dust, aqueous lime and sewage sludge (centrifuge and biodigestor) may affect soil physical attributes. The use of industrial and urban residues in soil, with emphasis to sewage sludge, was done in tilled soil, and there are no repports on soil physical attributes affected by these residues on soil surface in no-till system The goal of this study was to evaluate the physical attributes of a an Oxisol in no-till system by surface dispoasal of sewage sludge, flue dust, aqueous lime. The experiment was carried out under field conditions during the agricultural years of 2002 to 2005. Treatments were four residues sewage sludge centrifuged, sewage sludge biodigestor, flue dust and aqueous lime application on soil surface in four rates (0, 2, 4 e 8 t ha-1) and one control treatment, with 2 t ha-1 of dolomitc limestone. The experiment was set up in randomized block design, using 4 x 4 + 1 factorial design, with four replications. The Ca present in aqueous lime, sewage sludge centrifuged, flue dust and limestone increase aggregation of soil particles, DMP, IEA, total soil porosity and water retention, at this alteration due source, rate and soil depth. Surface application of aqueous lime at the rate 8 t ha-1, after 27 reaction month, allow the better aggregation of soil particles, since the surface into 40 cm depth.
Aggregation; mean pondered diameter; soil water retention; calcium; organic matter
