Abstract
The technique of precision agriculture and soil-landscape allows delimiting areas for localized management, allowing a localized application of agricultural inputs and thereby may contribute to preservation of natural resources. Therefore, the objective of this work was to characterize the spatial variability of chemical properties and clay content in the context of soil-landscape relationship in a Latosol (Oxisol) under cultivation of citrus. Soil samples were collected at a depth of 0.0-0.2 m in an area of 83.5 ha planted with citrus, as a 50-m intervals grid, with 129 points in concave terrain and 206 points in flat terrain, totaling 335 points. Values for the variables that express the chemical characteristics and clay content of soil properties were analyzed with descriptive statistics and geostatistical modeling of semivariograms for making maps of kriging. The values of range and kriging maps indicated higher variability in the shape of concave topography (top segment) compared with the shape of flat topography (slope and hillside segments below). The identification of different forms of terrain proved to be efficient in understanding the spatial variability of chemical properties and clay content of soil under cultivation of citrus.
Highlights
The technique of precision agriculture and soil-landscape allows delimiting areas for localized management, allowing a localized application of agricultural inputs and thereby may contribute to preservation of natural resources
Studies of soil-geomorphology relations have made great progress with the implementation of the concepts of landscape models, which take into account small gradients of topography, slope segments and surfaces as the geomorphic work TROEH (1965), RUHE (1969), DALRYMPLE et al (1968) and DANIELS et al (1971)
The objective of this study was to characterize the spatial variability of chemical properties and clay content in the context of soil-landscape in a Latosol (Oxiol) under citrus cultivation
Summary
The technique of precision agriculture and soil-landscape allows delimiting areas for localized management, allowing a localized application of agricultural inputs and thereby may contribute to preservation of natural resources. Together with the study of soillandscape relationships, seek to understand the spatial variability of soil properties, trying to establish relationships of cause and effect of the spatial distribution of soil and plant By understanding these variations, it is possible to delimit areas of localized management to optimize the application of inputs and to promote preservation of natural resources. Studies of soil-geomorphology relations have made great progress with the implementation of the concepts of landscape models, which take into account small gradients of topography, slope segments and surfaces as the geomorphic work TROEH (1965), RUHE (1969), DALRYMPLE et al (1968) and DANIELS et al (1971). During the cultivation of perennial plants, such as for citrus, the localized application of fertilizers constitutes a factor of anthropogenic variability. FARIAS et al (2003), studied the variability in orange orchards along the landscape and found that geostatistics was a very useful tool for precision agriculture program in citrus
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