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Pesquisa Agropecuária Brasileira

versão On-line ISSN 1678-3921

Resumo

AZEVEDO, Watson Rogério de; FAQUIN, Valdemar  e  FERNANDES, Luiz Arnaldo. Boron adsorption in lowland soils from Southern of the State of Minas Gerais, Brazil. Pesq. agropec. bras. [online]. 2001, vol.36, n.7, pp. 957-964. ISSN 1678-3921.  http://dx.doi.org/10.1590/S0100-204X2001000700005.

The objective of this study was to evaluate the B adsorption capacity in four lowland soils from Lavras, MG, Brazil, through Langmuir and Freundlich isotherm parameters. This study was conducted throughout October and November, 1998. Samples of Alluvial Soil, Low-Humic Gley, Humic Gley and artificially drained Bog Soil were collected in 0-20 cm of profundity and sieved to 2 mm. Samples with or without liming application were incubated during 30 days. Duplicates of 4.0 g soil samples, conditioned in polyethylene tubes, received eight doses of B (0, 2, 4, 8, 12, 16, 24 and 32 mg mL-1) prepared with 20 mL CaCl2.2H2O 0.01 mol L-1 solution, using boric acid. The amount of B in the balance solution was measured through the Azomethine-H method. The high organic matter content in Humic Gley soil provided higher B adsorption capacity. The adsorption was highly correlated with organic matter, specific surface area, kaolinite, and exchangeable aluminum. Lime application provided decrease in B adsorption capacity for all soils.

Palavras-chave : nutrient availability; liming; organic matter.

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