Abstract

ROSA, Stefanie Lais Kreutz et al. Propiedades física e hidráulicas del suelo en la región subtropical de Brasil. Cienc. suelo [online]. 2021, vol.39, n.2, pp.67-83. ISSN 1850-2067.

Agricultural systems can alter the soil physical and hydraulic properties, and consequently its quality. We aimed to determine and associate the physical and hydraulic properties of four soil types under no-tillage system in the Subtropical region of Brazil, as well as to create a data set available to be explored by further studies. Disturbed and undisturbed soil samples were collected from three layers: 0.0 - 0.10 m; 0.10 - 0.25 m; and 0.25 - 0.40 m at six localities in the Paraná and São Paulo States. Soil texture, soil bulk density and particle density, porosity (total, macro and micro), volumetric water content (permanent wilting point and field capacity), available water capacity and saturated hydraulic conductivity were determined. The average soil bulk density was within 1000 kg m(3 to 1400 kg m(3, which is considered optimum for the respective soil textures. The average total porosity (between 0.47 m3 m-3 and 0.63 m3 m-3) was close to an optimal condition for annual crop development under no-tillage system. The proportion between micro and macropores was approximately 2:1. The average values of soil available water capacity ranged from 48 mm to 60 mm. The average for the saturated hydraulic conductivity was classified as “moderate”. The management adopted for more than 20 years in the studied areas did not bring about critical values for the eleven physical and hydraulic soil properties examined, when compared to acceptable ranges verified in literature.

Keywords : texture; bulk and particle density; porosity; saturated hydraulic conductivity.

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