Chemical and mineralogical changes in a Brazilian Rhodic Paleudult under different land use and managements

摘要: Changes in land use and management can affect the dynamic equilibrium of soil systems induce chemical mineralogical alterations. This study was based on two long-term experiments (10 27 years) to evaluate used for no-tillage maize cultivation, with without poultry litter application (NTPL NTM), grazed native pasture fertilized cattle droppings (GrP), characteristics a Rhodic Paleudult Southern Brazil, comparison same under grassland (NGr). In four treatments, sampled from 0.0-2.5 2.5-5.0 cm layers. air-dried fine (ADFS) fraction (∅ < 2 mm), solid liquid phases specific surface area (SSA) were evaluated. The clay 0.002 mm) layer analyzed by X-ray diffraction (XRD) after treatments identification characterization 2:1 minerals. Animal waste increased total organic C concentration (COT) layer. NGr, (NTPL) concentrations Ca CECpH7, while (GrP) P K concentrations. solution, dissolved positively related COT levels. With regard crops (NTM NTPL) had practically no effect elements solution. On other hand, most solution higher GrP, especially Fe, Al Si. Fe iron oxides lower, indicating reductive/complexive dissolution crystalline forms. patterns GrP environment showed decrease intensity reflection fact, along intensified Si activity indicate minerals cattle-grazed animal droppings.