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Influence of the relief forms on physical attributes of an oxisol cropped with sugarcane

The physical attributes of the soil vary according to the relief forms and suffer from the mineralogy of the clay fraction and the management of the sugarcane culture, being able to influence the soil compaction process. This research was developed in Jaboticabal-SP, aiming at evaluating the behavior of physical attributes in different relief forms in an oxisol cropped with sugarcane. The area presents two relief forms (concave and linear), the concave one, that occurs at the highest positions, and the linear one, consisting of shoulder, scarp, stocking lean and inferior lean segments. The samples soil were collected during the sugarcane cycle, in the 0.00-0.15, 0.15-0.30 and 0.30-0.45m layers, for the determination of the organic matter and the following physical attributes: bulk density, total porosity, macro and microporosity, soil penetration resistance and soil moisture. The mineralogy most gibbsitic and the greatest value of organic matter, found in the concave relief form and in the shoulder segment, provide lower bulk density, soil penetration resistance and microporosity values and higher macroporosity and total porosity values when compared with the other segments of the linear form (caulinitic mineralogy).

soil-landscape relation; soil mineralogy; concave and linear forms


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