The conversion of native vegetation in agricultural systems can change with over the years of growing levels of C and N as well as the isotopic signal of 13C and 15N of soil. The objective of this study was to evaluate the contents of C and N and the natural abundance of δ13C and δ15N in the soil profile in a chronosequence of no-tillage agriculture (NT) in the Cerrado (tropical savanna) of Goias (GO), Brazil. For this purpose, areas under […]

Changes in land use and management can affect the dynamic equilibrium of soil systems and induce chemical and mineralogical alterations. This study was based on two long-term experiments (10 and 27 years) to evaluate soil used for no-tillage maize cultivation, with and without poultry litter application (NTPL and NTM), and with grazed native pasture fertilized with cattle droppings (GrP), on the chemical and mineralogical characteristics of a Rhodic Paleudult in Southern Brazil, in comparison with the same soil under native […]

No tillage systems significantly influence the soil system, but knowledge about the effects on the mineralogy of tropical and subtropical soils is limited. This study evaluated the long-term effects (26 years) of no-tillage (NT) on aluminum hydroxy-interlayered minerals of a subtropical Oxisol in Southern Brazil (Guarapuava, PR), compared to the same soil under conventional tillage (CT). The clay fraction (< 2 µm) in soil samples of the surface horizons of a field experiment under both management systems was analyzed by […]

Several studies have shown the satisfactory performance of the Century Model to study soil organic matter (SOM) for the climatic and edaphic conditions of Rio Grande do Sul. However, soil N stocks were usually overestimated in these simulations. The objective of this study was to parameterize the N cycle submodel of Century for a successful use in N dynamic studies in Southern Brazil. For the simulations, data from a long-term study site established in an Acrisol (Argissolo Vermelho distrófico) at […]

Soil management affects the soil physical quality, but the magnitude of the changes is dependent of use time and regional edaphoclimatic conditions. The objective of this study was to evaluate the long-term (21 yr) effect of conventional tillage (CT) and no-tillage (NT) systems on some physical properties in the 0.2 m top layer of an Oxisol from Paraná, southern Brazil. In comparison with an adjacent forest soil used as reference, the use of CT system increased the soil bulk density, penetrometer resistance […]