Abstract
Information on the spatial distribution of particle size fractions is essential for use planning and management of soils. The aim of this work to was to study the spatial variability of particle size fractions of a Typic Hapludox cultivated with conilon coffee. The soil samples were collected at depths of 0-0.20 and 0.20-0.40 m in the coffee canopy projection, totaling 109 georeferentiated points. At the depth of 0.2-0.4 m the clay fraction showed average value significantly higher, while the sand fraction showed was higher in the depth of 0-0.20 m. The silt showed no significant difference between the two depths. The particle size fractions showed medium and high spatial variability. The levels of total sand and clay have positive and negative correlation, respectively, with the altitude of the sampling points, indicating the influence of landscape configuration.
Highlights
Variability in soil particle size fractions directly influences the surface flow and water movement in the soil, erosion, cation exchange capacity and retention of water and nutrients, which makes the knowledge on these properties fundamental for a better use planning and soil management
Because the effects of the erosion can be dominant over the others, in the formation of the soil features, and this occurs in different directions and senses, its effect can be seen on the surface and/or in depth, changing the distribution of the attributes throughout the soil profile
The determination of particle size fractions was performed by slow agitation, followed by sedimentation assay in test tubes, according to Stokes law, following the methodology of Embrapa (1997)
Summary
Variability in soil particle size fractions directly influences the surface flow and water movement in the soil, erosion, cation exchange capacity and retention of water and nutrients, which makes the knowledge on these properties fundamental for a better use planning and soil management. According to Vieira et al (1988), other characteristics, such as infiltration, permeability to roots and aeration are greatly influenced by the soil texture. The slope and shape of the relief significantly influence the spatial distribution of soil attributes (Souza, 2001). According to Souza (2001), the evolution of the slope is associated with erosion caused by runoff of rainwater, forming one of the most important physical agents in the configuration of the terrestrial landscape. Because the effects of the erosion can be dominant over the others, in the formation of the soil features, and this occurs in different directions and senses, its effect can be seen on the surface and/or in depth, changing the distribution of the attributes throughout the soil profile
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