ABSTRACT Regosols in the Agreste Meridional region of Pernambuco, Brazil, are used for various agricultural activities, and prominent among them is production of common bean. An expressive variation is perceived in common bean crop yield, possibly associated with the presence of lamellae, which make for distinct water fluxes among these soils. The objective was to analyze the macro- and micromorphological, and physical characteristics of the Regosols located in the Agreste Meridional region of Pernambuco to understand the water fluxes in […]

ABSTRACT Conversion of a natural condition to agricultural use can impose changes in soil properties and processes and bring environmental consequences to the region this agricultural use encompasses. The aim of this study was to evaluate the physical quality of the soil in agricultural areas of municipalities around Sobradinho Lake, a semiarid region in the State of Bahia, using multivariate analysis statistical techniques as a tool. Initially, descriptive statistical analysis and correlation analysis techniques and the normality test were applied, […]

In the Jalapão region, State of Tocantins, Brazil, there are large contiguous areas of Neossolos Quartzarênicos (Tropsamments). Golden grass (Syngonanthus nitens) is a native species widely used as material for handicrafts in the region, and it is therefore of great importance for the local economy. The aim of this study was to analyze the relationship between soil physical and chemical properties and golden grass yield in Campos Limpos Úmidos within Jalapão State Park (Parque Estadual do Jalapão). We collected soil […]

In the west and southwest regions of Rio Grande do Sul (RS) there are extensive areas with fragile soils developed from sandy sediments of the continental Mesozoic Paraná Basin. Inappropriate land use has accelerated the process of sandy desertification in these areas. In this case, the knowledge of soils is critical for the choice of appropriate management systems to regain sustainability. The objectives of this study were to understand the evolution and describe the relationships, in terms of origin, between […]

There is lack of research on Argissolos (Ultisols and Alfisols) in relation to theunderstanding of the pedologic variations. Variations can be analyzed by multivariate statisticsand the data numerically classified. The comparison between the numeric classification andthe hierarchical classification can contribute to the evolution of the Brazilian Soil ClassificationSystem (SiBCS). The aims of this research were to analyze the pedologic variation of Argissolosderived from sedimentary materials in the central region of Rio Grande do Sul and to validatethe organization of the […]

Pasture-agroforestry systems have become an important strategy for the use of sandy soils in the Pampa Biome. The purpose of this study was to evaluate the aggregation, total organic C (TOC) and total nitrogen (TN), carbon of the physical fractions and humification degree of organic matter (OM). Evaluations were conducted in an Alfisol under homogenous eucalyptus forest (HF), between the rows of a pasture-agroforestry system (PA) and in native pasture (NP) in the layers 0.000-0.025, 0.025-0.075, 0.075-0.125, and 0.125-0.225 m. […]

The use of the pH SMP to estimate the potential acidity has advantages in relation to the 0.5 mol L-1, pH 7, calcium acetate method, but it requires previous edaphic regionalization to estimate the H + Al values with safety. In the northwestern region of the State of Paraná there are soils originally developed from sandy sedimentary rock of the Caiuá Formation, called Caiuá Sandstone, of the Cretaceous period. These soils are characterized by low contents of clay and organic matter, and a low buffer capacity, […]

Inadequate crop practices are among the main causes for reduced productivity of cashew crops in the Northeast of Brazil. Periodical elimination of vegetation and the use of heavy machines and implements influence soil temperatures and density, possibly affecting plant growthand development. This is an aggravating fact, considering the sandy soils and climate conditions of the region. This study had the objective to investigate the development of cashew nut plants (early-dwarf cultivar) at different levels of soil temperature and density, to […]