02224naa a2200301 a 450000100080000000500110000800800410001910000240006024500920008426000090017650001210018552012100030665000250151665000180154165000170155965000240157665000210160065000250162165300300164665300220167665300270169865300260172565300250175165300250177670000170180170000120181877300920183020574392017-05-24       2016    bl uuuu     u00u1 u    #d1 aSEBEN JUNIOR, G. de  aPhysical quality of an Oxisol under no-tillage subjected to different cropping systems.  c2016  aTítulo em português: Qualidade física de Latossolo sob plantio direto submetido a diferentes sistemas de cultivo.  aThe objective of this work was to evaluate the physical quality of an Oxisol under no-tillage subjected to different crop rotations and crop sequences. The experiment was carried out in a clayey Oxisol, during six years, in a randomized complete block design, with strip plots and three replicates. The following physical indicators of soil quality were evaluated: soil density and carbon content, as well as mean weight diameter and tensile strength of aggregates. Treatments consisted of three summer crop rotations ? corn/ corn (Zea mays), soybean/soybean (Glycine max), and soybean/corn ? and of seven second crops (crop sequences) ? corn, sunflower (Helianthus annuus), oilseed radish (Raphanus sativus), pearl millet (Pennisetum americanum), pigeon pea (Cajanus cajan), grain sorghum (Sorghum bicolor), and sun hemp (Crotalaria juncea). Crop rotations and sequences did not affect soil carbon contents. Corn, as a summer crop, increased the tensile strength and mean weight diameter of aggregates, similarly to pearl millet and sorghum as second crops. Soybean/corn rotation with sun hemp as a second crop increases soil physical quality, promoting higher tensile strengths and lower soil densities.  aCarbon sequestration  aCrop rotation  aSoil density  aSoil organic carbon  aTensile strength  aRotação de cultura  aCarbono orgânico do solo  aDensidade do solo  aDiameter of aggregates  aDiâmetro de agregado  aResistência tênsil  aSequestro de carbono1 aCORÁ, J. E.1 aLAL, R.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 51, n. 9, p. 1568-1574, set. 2016.