Presença de Alumínio Trocável em Solos de Região de Baixada Coletados no Estado do Maranhão
Keywords:Lowlands region, nutrients, maize, analysis, toxicity, aluminium.
A região da Baixada Maranhense inclui solos com alta fertilidade e largo potencial agrícola. Embora não exista sistema de manejo adequado para aumentar a produtividade. Este trabalho pretende caracterizar quimicamente quatro solos (Vertisolos) coletados na região e comparar com um solo controle (Argisolo). Em casa de vegetação, cultivou-se milho nos quatro solos estudados. Análises revelaram altos níveis de nutrientes e teores de Al, quando comparados com o solo controle. Ao mesmo tempo, foi verificado um alto crescimento de raiz, situação comum para plantas cultivadas em solos com baixos níveis de alumínio. Entretanto, mesmo com altos níveis de alumínio o crescimento da planta (nos quatro solos) não foi afetada. Este comportamento pode ser explicado pela presença de cálcio e magnésio, que inibem a toxidez de alumínio nas plantas.
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