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 […]

The present work had the objective to analyze the alterations of the physical properties of a dark-red Latosol (typic acrustox), under different use systems. In 1996, samples of soils were collected, under corn crop, pinus, eucalyptus, pasture, ciliary forest (after 10 years of cultivation), and native cerrado vegetation, in three depths (0,00-0,10; 0,10-0,20, and 0,20-0,40 m), in the experimental station from Faculdade de Engenharia de Ilha Solteira – UNESP, located in Selvíria county (MS). The experimental design was the totally […]

Tensiometers were installed in a 25 m2 area plot, every 15 cm, at depths varying from 30 to 240 cm, with three repetitions, to determine the matric potential (φm) of a “Terra Roxa Estruturada Latossólica” soil. Its volumetric water content was also indirectly measured by using the soil water retention curve. The θ-method (Libardi et al., 1980) fitted the soil redistribution profiles (θ vs t) with determination coefficients (R2) greater than 0.98. The hyphotesis of a unit hydraulic gradient was […]

In the no-tillage system, the absence of soil revolving, combined with the traffic of machines, promotes excessive soil surface compaction. An experiment was conducted in the county of Ponta Grossa, State of Paraná, Brazil, during the agricultural years of 1989/1990 and 1990/1991, with the objective of studying several factors that intervene in this process. This research compared the effects of three previous soil tillage methods and two liming levels on several physical properties of a clayey Dark Red Latosol under […]