CARACTERÍSTICAS FÍSICAS DE SOLOS SALINO-SÓDICOS SUBMETIDOS A PARCELAMENTO DA LÂMINA DE LIXIVIAÇÃO

Abstract

The aim of this work was evaluate the influence of leaching on chemical characteristics of saline sodic soil samples. Cylinders were filled with samples of soils FLUVENT (Ae1), FLUVENT collected at 0-20 cm (Ae2-s) and 20-50 cm (Ae2-i) depth, and VERTISOL (V). Gypsum was incorporated up to 15 cm depth in an amount to replace 100% exchangeable sodium. Leaching consisted in applying a solution with CaCl 2 and MgCl 2 , at one time only and the same volume fractionated in two, four and six times, respectively, with intervals of 22 days among each application. Clay dispersion and water retention capacity in soils diminished with the gypsum and leaching fractionation. In Ae1 soil, the infiltration rate was very low, then stopping its determination. In all soils, with the exception of V, because of the greater content of silt, the infiltration rate of the not-treated samples was lower compared with treated samples. In general, significant differences amongst leaching application were not detected for soil physics characteristics. Palavras chaves�� Salinidade, lixiviação de sais, recuperação de solos.