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1 RESUMO O objetivo deste trabalho foi avaliar os cations lixiviados em lisimetros de drenagem preenchidos com solo tipo Latossolo vermelho distroferrico tipico, cultivados com milho irrigado com agua residuaria de suinocultura (ARS). Os fatores estudados foram a adubacao quimica em dois niveis (50% e 75% do N recomendado para a cultura do milho na semeadura) e ARS em quatro niveis (112,5, 225,0, 337,5 e 450 m 3 ha -1 ) aplicados ao longo da cultura. A irrigacao foi realizada intercalando agua e ARS a cada 15 dias. Os cations avaliados no solo e no percolado foram K + , Na + , Ca 2+ , Mg 2+ . O delineamento experimental foi em esquema fatorial 4x2, com tres repeticoes por tratamento e avaliacoes em quatro periodos do desenvolvimento da planta. As medias foram comparadas pelo teste de Tukey a 5% de significância. Os resultados apontam que as concentracoes medias dos lixiviados foram maiores para os elementos quimicos estudados na seguinte ordem: Na + > K + > Ca 2+ >Mg 2+ . As taxas da agua residuaria de suinocultura produziram, proporcionalmente, maiores concentracoes medias nos lixiviados para Na + , apenas no ultimo periodo avaliado. A adubacao quimica influenciou nas maiores concentracoes do K + lixiviado. De modo geral, ao longo do experimento, foram observadas maiores concentracoes de Ca 2+ e Mg 2+ no solo e de Na + no lixiviado. Palavras-chave: efluente, reuso de agua, lisimetro. CATIONS LEACHING IN CORN CULTIVATED SOIL IRRIGATED WITH  SWINE WASTEWATER 2 ABSTRACT The objective of this work was to evaluate the cation´s leaching in drainage lysimeters filled with Red distroficoLatossolo cultivated with corn irrigated with swine wastewater. The factors and levels of treatments were: four levels of swine wastewater (112.5, 225.0, 337.5 and 450.0 m 3 ha -1 ), two levels of chemical fertilization (50% and 75% of N recommended) and three repetitions. The irrigation was made by applying alternating, water and swine wastewater, every 15 da ys. The evaluated cations in the soil and in percolated were K + , Na + , Ca 2+ , Mg 2+ . The experimental design was made in a 4x2 factorial scheme with three repetitions per treatment and four periods of evaluation during the plant’s growth season. The mean evaluation was compared by Tukey test at 5% significance. The leaching´s concentrations were larger for the chemical elements in the following order: Na + > K + > Ca 2+ > Mg 2+ . In general, swine wastewater levels produced proportional larger concentrations in the leaching of Na + , only on the last evaluated period. The chemical fertilization influenced the largest concentrations of the K + leaching. The largest concentrations of Ca 2+ and Mg 2+ occurred in the soil while Na + occurred in leaching. Keywords : effluent, water reuse, lysimeter

COMPORTAMENTO DE CÁTIONS EM SOLO CULTIVADO COM MILHO IRRIGADO COM ÁGUA RESIDUÁRIA DE SUINOCULTURA