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Forms and accumulation of copper and zinc in a sandy typic hapludalf soil after long-term application of pig slurry and deep litter

Successive applications of pig slurry and pig deep litter may lead to an accumulation of copper (Cu) and zinc (Zn) fractions in the soil profile. The objective of this study was to evaluate the Cu and Zn forms and accumulation in a Sandy Typic Hapludalf soil after long-term application of pig slurry...

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Published in:Revista Brasileira de Ciência do Solo 2013-06, Vol.37 (3), p.812-824
Main Authors: Tiecher, Tadeu Luis, Ceretta, Carlos Alberto, Comin, Jucinei José, Girotto, Eduardo, Miotto, Alcione, Moraes, Marcel Pires de, Benedet, Lucas, Ferreira, Paulo Ademar Avelar, Lorenzi, Cledimar Rogério, Couto, Rafael da Rosa, Brunetto, Gustavo
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Language:English
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Summary:Successive applications of pig slurry and pig deep litter may lead to an accumulation of copper (Cu) and zinc (Zn) fractions in the soil profile. The objective of this study was to evaluate the Cu and Zn forms and accumulation in a Sandy Typic Hapludalf soil after long-term application of pig slurry and deep litter. In March 2010, eight years after initiating an experiment in Braço do Norte, Santa Catarina (SC), Brazil, on a Sandy Typic Hapludalf soil, soil samples were collected from the 0-2.5, 2.5-5.0, 5-10 and 10-15 cm layers in treatments consisting of no manure application (control) and with applications of pig slurry and deep litter at two levels: the single and double rate of N requirement for maize and black oat succession. The soil was dried, ground in an agate mortar and analyzed for Cu and Zn contents by 0.01 mol L-1 EDTA and chemically fractionated to determine Cu and Zn. The applications of Pig deep litter and slurry at doses equivalent to 90 kg ha-1 N increased the contents of available Cu and Zn in the surface soil layer, if the double of this dose was applied in pig deep litter or double this dose in pig slurry, Cu and Zn migrated to a depth of 15 cm. Copper is accumulated mainly in the organic and residual fractions, and zinc preferentially in the fraction linked to clay minerals, especially in the surface soil layers. As aplicações sucessivas de dejetos líquidos e cama sobreposta de suínos podem provocar o acúmulo de frações de cobre (Cu) e zinco (Zn) no perfil do solo. Este trabalho objetivou avaliar as formas e o acúmulo de Cu e Zn em um Argissolo Vermelho com histórico de aplicação de dejetos líquidos e cama sobreposta de suínos. Em março de 2010, após oito anos da instalação de um experimento localizado no município de Braço do Norte, Santa Catarina, SC, sobre um Argissolo Vermelho, foram coletadas amostras de solo nas camadas de 0-2,5; 2,5-5,0; 5-10; e 10-15 cm, em tratamentos sem a aplicação de dejetos e com a aplicação de dejetos líquidos de suínos e de cama sobreposta de suínos em duas doses para suprir uma e duas vezes a necessidade de N para a sucessão milho e aveia preta. O solo foi seco, moído em gral de pedra ágata e submetido à análise dos teores de Cu e Zn por EDTA 0,01 mol L-1 e ao fracionamento químico de Cu e Zn. A aplicação de cama sobreposta de suínos e dejetos líquidos de suínos aumentou os teores de Cu e Zn disponíveis na camada superficial do solo; entretanto, quando se aplicaram a dose (equivalente a 90 kg ha-1 de
ISSN:0100-0683
1806-9657
0100-0683
DOI:10.1590/S0100-06832013000300028