Milho orgânico: impacto da adubação com lixiviado de aterro sanitário na composição química, produtividade e concentração de metais em grãos

Abstract

ResumoA aplicação de lixiviado de aterro sanitário em solo agrícola surge como alternativa para disponibilizar este efluente, tendo como fator limitante os metais pesados. A adubação com cinco doses de lixiviado de aterro sanitário (0; 32,7; 65,4; 98 AbstractThe use of landfill leachate in agricultural soils as fertilizer emerges as an alternative for the disposal of this effluent, however presence of heavy metals may be a limiting factor for that use. Fertilization with five doses of landfill leachate (0, 32.7, 65.4, 98.1 and 130.8 m 3 ha -1 ) and urea (120 kg ha -1 ) was evaluated in productivity, chemical composition and metal content of corn in crops 2010 and 2012. The accumulation of metals in leaf tissue was also evaluated in oats grown in the winter period, in the same experimental field. Productivity, besides the content proteins, lipids and ashes in grains increased with increasing doses of leachate. Concentration of Ca, Mg, Na, K, Zn, Cu, Ni and Pb in corn fertilized with landfill leachate did not differ from control without fertilization, except for Mn, which increased by applying leachate (p > 0.05). Increasing doses of leachate tended to raise the level of Pb (2010 crop)