Nutrient availability should not be represented only by the chemical analysis of the solid phase, which does not include its relation with the soil solution. A study was carried out to investigate the relationship between nutrients in solid phase and soil solution of a "Latossolo Roxo" (Oxisol) from Santo Ângelo, Rio Grande do Sul state, during the first year after the installation of the no-tillage and conventional systems an oat-soybean rotation. It was evaluated 144 soil samples sampled before and 2, 6, and 12 months after installation (except carbon that was used 24 samples 12 months after installation) and from three depths (0-2.5cm, 2.5-5.0cm and 5.0-15.0cm). Carbon and nutrient (Ca, Mg, Mn, K e P) were evaluated in solid phase and soil solution, and the relation between them was obtained through regression analysis. The results indicated that Ca, Mg, K, Mn, and P evaluated in soil solution were significantly related to those of the solid phase, excepted for carbon.
ionic dynamics; soil tillage; and chemical characteristics
