ABSTRACT Land use changes profoundly impact the natural dynamics of soil phosphorus (P), potentially leading to decreased P concentrations. This study aimed to evaluate the different P fractions in soils from Paraguay Central Chaco under pristine and anthropogenic conditions. A randomized complete block design was utilized with two treatments (pristine and anthropogenic usage). Thirty-four composite soil samples were collected from the region at the layer of 0.00-0.20 m, followed by chemical fractionation of P into labile, moderately labile, and non-labile […]

ABSTRACT Correctly interpreting soil fertility and its spatial distribution within an area helps to lessen losses and environmental effects associated with agriculture, to optimize fertilization and liming practices. This study is aimed at using concepts and methods from spatial and temporal analyses to soil fertility and to develop a fuzzy classification methodology in an effort to define input application zones in three conilon coffee harvests. An irregular network with georeferenced points was built in the central region of the farm. […]

The organic matter dynamics in Atlantic forest ecosystems must be understood to ensure the efficiency of conservation programs. Chemical characteristics of humic substances are important because they reflect the soil genesis processes and soil management, and can be used as indicator of the organic matter quality. The purpose of this study was to test the organic matter quality as a marker of the soil environment in areas of native Atlantic forest developed on a distrophyc Gleysol and a distrophyc Cambisol […]

The alluvial soil of the Assunção Island, in the São Francisco River, Cabrobó, State of Pernambuco, Brazil, has been intensively cultivated with annual crops under irrigation. The present yields are unsatisfactory due to the use of inadequate agricultural practices that are not sustainable. This study aimed to survey the soil chemical properties in an area of 1,131 ha by collecting 1,053 samples in the 0-0.30 m surface soil layer. The samples were analyzed for chemical properties and the data were […]

Humus forms allow the characterization of either a natural forest ecosystem or disturbed forests. Under this perspective, we aimed to identify the humus forms in three Tabuleiro Forest sites in northern Espírito Santo: two primary forests, “Mata Alta” and “Mata de Córrego”, and one secondary forest resulting from slash and burn, over 40 years old (Capoeira Queimada). Therefore, the holorganic horizons were studied in regard to the pedological parameters of the mineral soil. At “Mata Alta”, a mesotrophic mull was […]

The main purpose of this work was to evaluate differences in the superficial organic accumulation in soil with regard to some pedological parameters of a secondary forest (older than 40 years) submitted to anthropic intervention, i.e., harvest of economically important tree species. Thus, the present work compares two sites of the “Tabuleiro” Atlantic Forest in northern Espírito Santo: a primary forest, the “Mata Alta”, and a secondary forest, the “Capoeira de Extração”. The organic matter accumulation below the “Mata Alta” […]