Volume 32, Number 1, 2008

The total organic carbon (TOC) in soils can be estimated by dry and humid combustion methods. Both have some drawbacks, mainly the humid combustion, which demands high reagent quantities and generates toxic waste containing chromium. The Mebius in Block method was developed to decrease the quantity of Na dichromate used in analyses. The objectives of this study were to verify the precision and accuracy of the Mebius in Block compared with other wet and dry combustion methods. The study was […]

The use of electrochemical attributes has been suggested by a number of authors to characterize the colloidal soil compound and to serve as evaluation indices of certain properties related to plant fertility and nutrition and to pedogenesis, underlying regional soil differentiation. In this study, the relations between the point of null saline effect (PESN) and chemical properties of three Oxisols of a toposequence in the microbasin Chico Nunes, Mato Grosso were evaluated. Surface and subsurface samples were submitted to chemical, […]

Brazilian soil surveys are mostly outdated, with few details, usually based on discovery and recognition. This fact can be ascribed to the traditional, slow and expensive soil survey method, requiring a great number of field observations. Thus, faster and cheaper soil mapping techniques must be developed. The objective of this study was to characterize soil mapping units in the region of Ibaté and São Carlos, state of São Paulo, measuring slopes and altitudes, based on a digital elevation model (DEM). […]