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To evaluate the effectiveness of applying different levels of gypsum, the recovery of salinesodic soils and its influence on the chemical characteristics of soils fixed with plaster, an experiment was conducted in soil columns, installed in the soil mechanics laboratory Federal Rural University of Pernambuco. The treatments were arranged in a randomized block design with a factorial arrangement of 2 x 5 (two solos x five levels of need for plaste), with five replications. The levels were equivalent to 50, 100 , 150, 200 and 250 % of plaster need determined by the modified method of Schoonover (Schoonover M -1), incorporated into the first 12.5 cm of the soil column . Were evaluated exchangeable sodium, exchangeable sodium percentage (ESP), Electrical Conductivity (EC), soluble cations and sodium adsorption ratio (SAR) in the saturation extract. The application level of 100 % of the need to plaster, obtained by the method of Schoonover M- 1, followed by leaching depth was effective for the correction of soil sodicity (PST < 15 %). The blade leaching corresponding to three times the pore volume of the soil salinity corrected when the levels of 50 and 100% of plaster need were used (EC <4.0 dS m-1).

Application of gypsum requirement levels and water depth for correction the sodicity and salinity of saline-sodic soils