Metais pesados do solo após aplicação de biossólido: II - Disponibilidade
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Data
2004-06-01
Autores
Borges, M. R.
Coutinho, Edson Luiz Mendes [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Ciência do Solo
Resumo
A utilização agrícola de resíduos industriais e urbanos com elevados teores de metais pesados tem aumentado a preocupação em determinar quais as concentrações disponíveis destes elementos no solo. Neste sentido, foi realizado um experimento, em casa de vegetação da FCAV-UNESP, com objetivo de comparar métodos de análise (DTPA, HCl 0,1 mol L-1, Mehlich-1 e Mehlich-3) para avaliação da disponibilidade de Cu, Mn, Ni, Pb e Zn para plantas de milho (Zea mays L.), cultivadas em dois solos que receberam biossólido e corretivos. O delineamento experimental utilizado foi inteiramente casualizado, com três repetições, segundo o esquema fatorial 2 × 2 × 5 (dois solos, presença ou ausência de corretivos e cinco doses de biossólido). Os solos utilizados foram: Neossolo Quartzarênico órtico típico (RQ) e Latossolo Vermelho eutroférrico argiloso (LV). Nos tratamentos com calagem, foram adicionados materiais corretivos para elevar o pH(CaCl2) do solo a 5,3. As doses de biossólido utilizadas foram de 0; 13; 26; 52 e 78 g vaso-1 (equivalentes a 0; 10; 20; 40 e 60 t ha-1), com base no material seco. Nenhum dos extratores testados se destacou para avaliação conjunta de todos os metais. A inclusão do pH do solo nos modelos de regressão melhorou significativamente a relação entre o Mn acumulado na parte aérea das plantas e o determinado pelos extratores.
The use of industrial and city wastes with high heavy metal contents in agriculture have increased the need for obtaining the concentration of such elements that are available in the soil. Thus, a greenhouse experiment was carried out at the FCAV-UNESP, in Jaboticabal, São Paulo State, Brazil in order to compare analysis methods (DTPA, HCl 0.1 mol L-1, Mehlich-1, and Mehlich-3) to evaluate the Cu, Mn, Ni, Pb, and Zn availability for corn (Zea mays L.) plants in two soils (an Eutrustox and a Ultipsamment). A complete randomized design with three replications of treatments in a 2 × 2 × 5 factorial arrangement (two soils, presence or absence of lime, and five sewage sludge rates) was used. In the limed treatments the soils were amended with agricultural lime to raise the soil pH (CaCl2) to 5.3. The sewage sludge rates (dry weight basis) were equivalent to 0, 10, 20, 40, and 60 t ha-1. All the extractants tested proved inefficient to evaluate availability of all metals concurrently. The inclusion of the soil pH in the regression models significantly improved the relationship between the amounts of Mn accumulated in the shoot and those extracted with DTPA, HCl 0.1 mol L-1, Mehlich-1, and Mehlich-3.
The use of industrial and city wastes with high heavy metal contents in agriculture have increased the need for obtaining the concentration of such elements that are available in the soil. Thus, a greenhouse experiment was carried out at the FCAV-UNESP, in Jaboticabal, São Paulo State, Brazil in order to compare analysis methods (DTPA, HCl 0.1 mol L-1, Mehlich-1, and Mehlich-3) to evaluate the Cu, Mn, Ni, Pb, and Zn availability for corn (Zea mays L.) plants in two soils (an Eutrustox and a Ultipsamment). A complete randomized design with three replications of treatments in a 2 × 2 × 5 factorial arrangement (two soils, presence or absence of lime, and five sewage sludge rates) was used. In the limed treatments the soils were amended with agricultural lime to raise the soil pH (CaCl2) to 5.3. The sewage sludge rates (dry weight basis) were equivalent to 0, 10, 20, 40, and 60 t ha-1. All the extractants tested proved inefficient to evaluate availability of all metals concurrently. The inclusion of the soil pH in the regression models significantly improved the relationship between the amounts of Mn accumulated in the shoot and those extracted with DTPA, HCl 0.1 mol L-1, Mehlich-1, and Mehlich-3.
Descrição
Palavras-chave
micronutrientes, extratores, lodo de esgoto, Latossolo, Neossolo, micronutrients, extractant, sewage sludge, Eutrustox, Ultipsamment
Como citar
Revista Brasileira de Ciência do Solo. Sociedade Brasileira de Ciência do Solo, v. 28, n. 3, p. 557-568, 2004.