12 results

Relation between pedologic horizons and hydraulic properties of two oxisols

J. D. Marques, P. L. Libardi, Q. Jong van Lier

01/Sep/2002

An experiment was carried out to verify if soil hydraulic properties change according to pedologic horizon division. Two oxisols were morphologically described and undisturbed soil samples in five replicates were taken at every 0.10 m down to 1.0 m soil depth for the determination of the hydraulic conductivity in saturated soil (Ko) by the falling-head method, and of soil water retention curves (ψm (θ)) by means of porous plate funnels (tensions of 1, 2 and 4 kPa) and porous plate […]

Changes in physical and hydric properties in Hapludox by phosphorus sorption

R. B. Silva, J. M. Lima, M. S. Dias Junior, F. A. M. Silva

01/Dec/2001

High phosphorus (P) sorption capacity is a typical feature of oxidic oxisols. P is mainly sorbed by inner-sphere complex affecting charge balance, particle dispersion and, consequently, water-soil relationship. The objective of this study was to evaluate the effect of P sorption on physical and hydric properties of samples of a Typic Hapludox, from Campos Mantiqueira Region (Minas Gerais, Brazil). Disturbed and undisturbed soil samples, from 0-0.03 and 0.27-0.30 m depth, were saturated in pure water or P solution to reach […]

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