02220naa a2200325 a 450000100080000000500110000800800410001902400390006010000190009924501300011826000090024852012500025765000240150765000170153165000270154865000090157565000080158465300140159265300200160665300220162665300200164865300200166865300200168870000210170870000180172970000200174770000180176770000150178577300940180020121042016-02-23       2015    bl uuuu     u00u1 u    #d7 a10.1590/0001-37652015201300662DOI1 aFEITOZA, J. R.  aPhysical attributes of ultisol of Brazil's Northeastern semiarid under organic farming of wine grapes.h[electronic resource]  c2015  aThe purpose of this study was to evaluate the effects of organic farming of wine grapes under physical and chemical characteristics of Ultisol Brazil?s northeastern semiarid region. The samples of soil were collected from the row and interrow of the farming and from the fallow area, at the depths of 0.0-0.10, 0.10- 0.20, 0.20-0.30 and 0.30-0.60 m. The samples were collected at six and twelve months after the culture implementation to evaluate the state of aggregation, bulk density and total soil porosity, flocculation index and organic matter contents, calcium, magnesium, and sodium. The results were submitted to statistical analysis. The adoption of organic farming contributed to the soil aggregation process. The bulk density and total soil porosity did not differ significantly between the evaluations, but were within the critical limits for sandy soils. The index flocculation did not have a great influence on the aggregates formation, being this process influenced by organic matter. The period of one year was considered short to obtain conclusive results in improving the soil quality by organic farming, since there are difficulties in tropical soils in promoting significant increases in organic matter content in short time.  aAggregate stability  aSoil quality  aAgricultura Biológica  aSolo  aUva  aArgissolo  aOrganic farming  aQualidade do solo  aUvas para vinho  aVitivinicultura  aVitiviniculture1 aMENDES, A. M. S.1 aOLSZEVSKI, N.1 aCUNHA, T. J. F.1 aCORTEZ, J. W.1 aGIONGO, V.  tAnais da Academia Brasileira de Ciências, Rio de Janeirogv. 87, n. 1, p. 483-493, 2015.